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 Chest: Collect 6 Skulls
Hayabusa Helmet: Collect 13 Skulls
Hayabusa Shoulders: Collect 9 Skulls

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.” Note: This Skull has to be activated before you start a campaign map.

Catch Skull: In “The Storm” mission, go to where the first anti-air Wraith tank is located. There is a large gray cylinder in the 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. Note: Do not destroy the Wraith near the door or the Skull will disappear. The Skull description reads “Pull pin. Count to three. Throw.” When this Skull is active, every NPC will carry two grenades and throws them often.

Alternately, take a Warthog, and park the front of it next to the cylinder. Take out a grenade (plasma recommended), 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.

Alternately, play in Co-op mode. Have a partner stand beside the building the Skull is on. Jump on top of them, then have them jump. At the peak of their jump, jump off of them. You will land next to the Skull. Collect it, 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 risers (platforms) 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, dropped weapons will have very little ammunition compared to normal.

Use the following trick instead of trying to get a Ghost to the Famine Skull or risking your life with a grenade. Instead of going straight to it, go the way you do later in the level with the tank. Kill all the enemies or until one drops a deployable cover. Go the way you would have. When you get over the hill, destroy the Ghosts. Go under the bridge. You will see a big rock with a pathway leading up. Follow it. When you get to the top, turn to your right. It will not have a dirt ramp, but a wall. Walk up to it. Notice the small ledge. Jump up, and walk all the way to the right. Deploy the cover so that it lands about halfway down to where the bridge slopes. Do not throw too far or it go over the ledge. Jump on top of the cover. Jump up to the narrow ledge to get the Skull. Note: There is more than one way to jump from cover to ledge; try a few if you miss.

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,