Bonus downloadable content:
Successfully complete the game on the Legendary difficulty to get bonus pictures and a "Making of" video from Xbox Live.
Infinite Spartan laser in Halo mission:
Use the following trick to get a Spartan laser with unlimited ammunition in the "Halo" mission. Play through the level until you meet up with Sergeant Johnson. Shoot him until he falls down and drops the Spartan laser. Quickly pick it up, and shoot it at him. Keep shooting him until he kills you. When you respawn, knock him down again, and pick up his laser. He should get back up with another laser on his back. When he does, shoot him down again, and pick up the new gun he drops. This laser should now have unlimited Spartan ammunition. This makes it easier to destroy the Guilty Spark 343.
Katana:
Successfully complete all achievements (1000/1000) and find all Skulls to unlock the Katana.
Recon armor (Mythic Map Pack DLC):
Get the three "Vid Master Challenge" achievements in the "Mythic Map Pack" bonus downloadable content to unlock the Recon armor.
Alternate endings:
There are three endings. The first ending is shown when the game is successfully completed on the Easy, Normal, or Heroic difficulty setting. The second ending is shown when the game is successfully completed on the Legendary difficulty setting. The third ending is shown when the game is successfully completed on the Legendary difficulty setting with all Skulls activated.
Easier Legendary mode:
If you are playing alone on the Legendary difficulty setting, turn on an idle second player to stay behind. If you die, you will respawn instead of restarting.
Super fast Spartan laser fire:
In Forge mode, get a Spartan laser. Charge it until it is almost about to fire. Before you fire, turn into the Monitor. Fly around until you find a target. Before you turn back into a human, hold RT to fire the Spartan laser almost instantly (if done correctly). You can use the Monitor's aimer to aim the laser.
Smarter respawning:
When playing in Co-op mode on the Legendary difficulty setting, it is best to have one player keep their distance from the enemy at all times. By doing this, if the rest of the players die, they will respawn around the player that is farther back, rather than having to restart at the checkpoint.
Preventing lag:
To clear the hard drive cache and prevent lag in Solo and Multiplayer mode, when starting the game, hold A + Up. Select "Yes" when you are asked if you want to clear the cache.
Extra grenades:
In Multiplayer or System Link mode, when you kill someone, slash their dead body with the Energy Sword for more grenades come out of it.
Note: Successfully complete the indicated task in Campaign mode to unlock the corresponding armor part in Multiplayer mode:
Elite:
Ascetic Body: Accomplish the "Up Close and Personal" achievement.
Ascetic Head: Accomplish the "Steppin' Razor" achievement.
Ascetic Shoulders: Accomplish the "Overkill" achievement.
Commando Body: Accomplish the "Triple Kill" achievement.
Commando Head: Accomplish the "Overkill" achievement.
Commando Shoulders: Accomplish the "Killing Frenzy" achievement.
Flight Body: Successfully complete the "Tsavo Highway" mission on the Heroic or Legendary difficulty setting.
Flight Head: Successfully complete Campaign mode on the Heroic difficulty setting.
Flight Shoulders: Successfully complete "The Ark" mission on the Heroic or higher difficulty setting.
Spartan:
EOD Body: Successfully complete the "Tsavo Highway" mission on the Legendary difficulty setting.
EOD Head: Successfully complete Campaign mode on the Legendary difficulty setting.
EOD Shoulders: Successfully complete "The Ark" mission on the Legendary difficulty setting.
EVA Body: Successfully complete the "Tsavo Highway" mission on the Normal or higher difficulty setting.
EVA Head: Successfully complete Campaign mode on the Normal difficulty setting.
EVA Shoulders: Successfully complete "The Ark" mission on the Normal or higher difficulty setting.
Mark V Head: Accomplish the "UNSC Spartan" achievement.
ODST Head: Accomplish the "Spartan Graduate" achievement.
Rogue Head: Accomplish the "Spartan Officer" achievement.
Scout Body: Accomplish the "Too Close to the Sun" achievement.
Scout Head: Accomplish the "Used Car Salesman" achievement.
Scout Shoulders: Accomplish the "Mongoose Mowdown" achievement.
Security Head: Earn 1000 Gamerscore points.
Security Shoulders: Accomplish the "Marathon Man" achievement in the Campaign Meta-game.
Hayabusa armor:
Note: Collect the indicated number of Skulls to unlock the corresponding piece of Hayabusa armor:
Hayabusa Chest: Collect 6 Skulls
Hayabusa Helmet: Collect 13 Skulls
Hayabusa Shoulders: Collect 9 Skulls
Skull locations:
Note: You can only collect Skulls on the Normal, Heroic, and Legendary difficulty setting. You must start from the beginning of the mission. You will not be able to see the Skulls if you load from a checkpoint, unless doing so after dying.
Note: In Co-op mode, as soon as one player picks the Skull up, all players will receive the achievement if there is one. Not all Skulls earn an achievement; only nine of them do. To use Skulls, press X at the lobby screen. This will give you a bonus multiplier for Co-op mode and go towards earning achievements.
Black Eye Skull: At the start of the "Crow's Nest" mission, without moving anything, you can see a huge pipe above you. Walk up the stairs, then up the next set. Turn to your left and jump up on the shelf unit. Jump to the red cross beam, then up onto the pipe. Then, just walk to the end. Walk over the Black Eye Skull to collect it. You do not have to pick this Skull up, it does it automatically. The Skull description reads "Bash your way to better health." When this Skull is active, your shield will instantly charge when you use melee attacks, and will not auto-recharge anymore.
Blind Skull: In the "Sierra 117" mission, when you get to the area where you see the Phantom overhead (one of the marines will point it out), jump over the rocks, and keep following the path on the right. When you get to the cliff, there will be a rock over the side. The Skull is on the end of the rock. The Skull description reads "Shoot from the hip."
Catch Skull: In "The Storm" mission, go to where the first anti-air Wraith tank is located. There is a large gray cylinder in that area on the ground on the far side from where you enter. The Skull is on the top of the silo. To get up there, perform a grenade jump off a Warthog or use a vehicle to push a large crate to the side of it; jump on the crate, then the silo.
Another method is to take a Warthog, and park the front of it next to the cylinder. Take out a grenade (plasma is best), and throw it at the front of the Warthog. Jump at the correct moment (usually as soon as you throw it) to get a little extra boost to your jump to get to the top to reach the Skull. This may require a few attempts.
A third choice to reach this skull is to play in Co-op mode. Have a partner stand beside the building the Skull is on. Jump on top of them, and then have them b jump. At the peak of their jump, jump off of them. You will land next to the Skull. Collect it, and then drop down to allow everyone else to get it.
Cowbell Skull: In "The Ark" mission, pick up a Grav Lift from the small building near where you fight the Scarab. Then, proceed through the level until you reach the second sloping hallway (stairway). You should see some partitioned halfway down. The Skull is on the top level. Throw the Grav Lift on the right side of the hall so it lands on the fourth little green dot from the door. Then, run, jump, and use the Grav Lift to propel you to the top. You should reach a checkpoint just as you enter the room, so if you miss you can try again. When this Skull is active, explosive force is increased.
Famine Skull: In "The Ark" mission, when you first go into the valley to the right after the wrecked Phantom, look to your left to see a huge boulder. Use a Ghost to get to the side of the boulder that is closest to the bridge overhead. It is easy to pilot the Ghost up the side of the wall using the thrust. To get the Skull, pilot two Ghosts up the wall to the top of the bridge and stack them on top of one another next to the beam where the Skull is placed. Then, jump from the top of the Ghosts towards the Skull and land on the beam. The Skull description reads "Trust us. Bring a magazine." When this Skull is active,
Fog Skull: In the "Floodgate" mission, as you are walking down from the anti-air gun you destroyed in the previous mission, there will be a ramp (next to a missile launcher). Around this ramp, there is a checkpoint. At this point, you should also hear a marine yelling, “There! Over There!” Look up and to the right, directly at the roof of the building next to the missile launcher. There is a Flood form (not to be mistaken with the two other Flood forms jumping in front of you), which is holding the Skull. Kill him before he jumps, and he will drop the Skull down to the ground where you can retrieve it.
Grunt Birthday Party Skull: In the "Crow's Nest" mission, immediately after the first objective, while en route to the barracks, you will fall down to a pipe. Go to the end of that pipe, and then look over the edge to find a small space a few feet below. Drop over, and then quickly pull back to land under the floor you dropped from. The Skull is at the end of this area. When this Skull is active, it makes Grunts explode in confetti when they are headshot. There will also be some cheering, like a birthday party.
Iron Skull: In the "Sierra 117" mission, after freeing Johnson and killing all the Covenant that come in the Phantoms, walk to the Pelican that arrives to pick you up. Face the cargo bay, but instead of going in, turn left and follow the path. Once you hit the wall, jump up to your right to eventually reach a walkway. Walk all the way to the end. Take a left, then a right. At the end of this, a little bit to the right is a dark corner. Press Up to turn your light on and you should see the Skull. If you cannot see it, you are probably standing on it. The Skull description reads "Death carries a heavy price...". When this Skull is active, instead of losing 25 points when you die, you will lose 75.
IWHBYD Skull: In "The Covenant" mission, go to the last tower. Before you get to the Prophet of Truth, there are a series of bridges with Halos. Do not jump through any yet. First, kill the Prophet of Truth, and defeat the bridges of enemies. Then, jump through the Halos in this order, with "1" being at the entrance and "7" being the end near where the Prophet of Truth was located: 4, 6, 5, 4, 5, 3, 4. Alternately, jump through the Halos in the following order: 4, 5, 6, 5, 7, 6, 5, 4, 1, 2, 3, 2, 7, 2, 1, 3, 4, 6, 7, 5, 4, 5, 3, 4. This is much easier in Co-op mode with three or four people. If done correctly, the Halos will start flashing, and the Skull will appear near the Prophet's ramp. If the Halos do not flash, try again. The Skull description reads "But the dog beat me over the fence." When this Skull is active, there is bonus dialogue throughout the game. IWHBYD stands for "I Would Have Been Your Daddy", which is a level chapter from the original Halo.
Mythic Skull: In the "Halo" mission, follow the normal path until you reach a cave. Follow the right wall until it branches off into a small path. At the end of this path is some rubble, and in front is the Skull. The Skull description reads "Coverage under the Covenant health plan." When this Skull is active, you will get a 3x score multiplier for all kills.
Thunderstorm Skull: In "The Covenant" mission, after you shut down the first tower and get access to the Hornet, fly to the second tower (the one the Arbiter shut down). While walking up the stairs, go to the middle part that connects both, and there should be stairs leading up to a platform where the Skull is. The Skull description reads "Field promotions for everyone!" When this Skull is active, enemies will be much stronger.
Tilt Skull: In the "Cortana" mission, when in the circular type room with all the Flood, look for a small structure piece next to two archways. Jump on top of it, then go up on the rocks to the top left. Turn left and jump up again, then turn 180 degrees and jump to the rocks across from you. Then, follow the rock sticking out and leading up on top of the original circular room. The Skull is in a pool of blood. The Skull description reads "What was once resistant is now immunity." When this Skull is active, enemies will have different body parts that are resistance to certain bullet types.
Tough Luck Skull: In the "Tsavo Highway" mission, once you get past the part where you are forced to leave your vehicle, you will go through a tunnel and onto an open freeway. Immediately after coming out of the tunnel, you will see a huge pipe with two yellow ladders. Climb the second ladder. You should see a Regenerator power-up. Proceed to your right onto a small platform ledge where the yellow chain link fence is located. Jump onto that ledge, crossing over the fence. Directly behind you should be a large column that is holding up the giant pipe you were just on. Below that is a walkway. Fall off the ledge onto the walkway. Walk to the end of that. You should see a hidden ledge with the Skull on it. A few attempts may be required to jump across. The Skull description reads "Your foes always make every saving throw."
The following Skulls require the "Mythic Map Pack" bonus downloadable content:
Assembly Skull: Located on the central tower in Forge.
Orbital Skull: Go to where there are two roadblocks where you have to jump. The Skull is on top of the structure on the right.
Sandbox Skull: Fly towards the sunset, and turn around to find the Skull.
Terminal locations:
The following is a list of all seven Terminal locations. To accomplish the "Marathon Man" achievement, when you find each Terminal, press RB to view the journal. The screen will eventually start to turn red. Wait until it turns blue again and a new entry will appear. You need to view both entries in all Terminals for it to count towards the "Marathon Man" achievement.
The Ark:
1. Start the mission, and then once you enter the first building, go left into another door. You should now be in a curved corridor. On the inside is a Terminal.
2. After activating the bridge to let your comrades across the gap, turn 180 degrees, and you should see a Terminal (it does not open until you activate the bridge).
3. In the third building after defeating the Scarab, kill the group of sleeping Covenant, then follow the corridor downwards. Once you reach a door in front that is locked, immediately on the left there is an open door. Go through and walk straight off, then turn 180 degrees to find a secret room with a Terminal.
The Covenant:
4. When in the first tower standing on the lift, face the access panel and turn left. Jump over to find a Terminal.
5. Land your Hornet on the second tower, walk towards the entrance, but when you see the locked door, turn 180 degrees. A Terminal should be right in front of you.
6. When in the third tower standing on the lift, face the access panel and turn right. Jump over to find a Terminal.
Halo:
7. After reaching the end of the first cave, follow the right wall, and you will see a building. Jump up on the walkway, then go left once inside to find a Terminal.
Multiplayer medals:
Successfully complete the indicated task in Multiplayer mode to unlock the corresponding medal. Once you unlock most medals, they will be displayed in the corner of the screen and at the end of the match. You can view all earned medals on Bungie's official website.
Note: There are two medals (Linktacular and Steaktacular) which will not display a confirmation once you unlock them, but they will still appear in your medal history.
Assassin: Hit and kill an opponent with a melee attack from behind.
Beat Down: Hit and kill an opponent with a melee attack.
Bomb Planted: Plant the bomb in an Assault game type.
Bulltrue: Kill an opponent who is in the act of a sword lunge.
Death from the Grave: Kill an opponent after you have died.
Double Kill: Kill 2 opponents within 4 seconds of each other.
Extermination: Get overkill on the opposing team, wiping out all of the members.
Flag Kill: Get a melee kill with the flag in a CTF game type.
Flag Score: Capture the opposing team's flag in a CTF game type.
Grenade Stick: Kill an opponent by sticking him/her with a Plasma Grenade or a Spike Grenade.
Hail to the King: Kill 5 consecutive opponents in a single life from inside the hill before it moves in a King of the Hill game type.
Hell's Janitor: Kill 10 zombies in a row as a human without dying in an Infection game type.
Highjacker: Board an enemy ground vehicle.
Incineration: Kill an opponent by using the Flamethrower.
Infection Spree: Kill 5 humans in a row as a zombie without dying in an Infection game type.
Invincible: Kill 30 opponents in a row without dying.
Juggernaut Spree: Kill 5 consecutive opponents in a single run as the Juggernaut in a Juggernaut game type.
Killapocalypse: Kill 9 opponents within 4 seconds of each other.
Killed Bomb Carrier: Kill the opposing bomb carrier in a Assault Gamtype.
Killed Flag Carrier: Kill the opposing flag carrier in a CTF game type.
Killed Juggernaut: Kill the Juggernaut in a Juggernaut game type.
Killed VIP: Kill the opposing VIP in a VIP game type.
Killimanjaro: Kill 7 opponents within 4 seconds of each other.
Killing Frenzy: Kill 10 opponents in a row without dying.
Killing Spree: Kill 5 opponents in a row without dying.
Killionaire: Kill 10 opponents within 4 seconds of each other.
Killjoy: End an opponent's killing spree -- any spree.
Killtacular: Kill 5 opponents within 4 seconds of each other.
Killtastrophe: Kill 8 opponents within 4 seconds of each other.
Killtrocity: Kill 6 opponents within 4 seconds of each other.
Laser Kill: Kill an opponent by using the Spartan Laser.
Last Man Standing: Be the last human of the game in an Infection game type.
Linktacular (secret medal): Play in a matchmade game comprised of all Bungie.net users.
Mmmm Brains: Kill 10 humans in a row as a zombie without dying in an Infection game type.
Oddball Kill: Get a melee kill when holding the ball in an Oddball game type.
Open Season: Gun down 10 opponents with a Shotgun in a row without dying.
Overkill: Kill 4 opponents within 4 seconds of each other.
Perfection: Win a slayer game with 15+ kills without dying.
Rampage: Kill 20 opponents in a row without dying.
Running Riot: Kill 15 opponents in a row without dying.
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