Complete the level “The Library” on Heroic difficulty or higher without dying.
Unlocked: 27 Nov 2011 20:24:02
Headhunter
50Locate all the skulls hidden throughout the campaign.
Unlocked: 27 Nov 2011 20:22:48
Read all of the terminals hidden throughout the campaign.
Unlocked: 27 Nov 2011 19:32:36
Kill every Elite on the level “Keyes” on Heroic difficulty or above.
Unlocked: 26 Nov 2011 18:01:14
Complete the level “Two Betrayals” on Legendary difficulty without picking up a new weapon.
Unlocked: 26 Nov 2011 16:28:33
Escape the Forerunner facility on the level “343 Guilty Spark” in 21 minutes or less.
Unlocked: 24 Nov 2011 11:53:23
The Maw
25Complete the level “The Maw” on any difficulty.
Unlocked: 24 Nov 2011 11:35:20
Complete every level of the game on Normal difficulty.
Unlocked: 24 Nov 2011 11:35:20
Complete every level of the game on Heroic difficulty.
Unlocked: 24 Nov 2011 11:35:20
Complete every level of the game on Legendary difficulty.
Unlocked: 24 Nov 2011 11:35:20
Escape “The Maw” on Legendary with at least a minute left on the count down.
Unlocked: 24 Nov 2011 11:32:14
This Side Up
10Complete the Warthog ride on the level “The Maw” without being forcibly ejected from your vehicle.
Unlocked: 24 Nov 2011 11:17:36
Keyes
25Complete the level “Keyes” on any difficulty.
Unlocked: 23 Nov 2011 23:31:45
Popcorn.gif
25Kill 100 Flood Infection Forms on the level “Keyes” on Heroic difficulty or above.
Unlocked: 23 Nov 2011 20:37:15
Complete the level “Two Betrayals” on any difficulty.
Unlocked: 23 Nov 2011 20:17:26
Complete the level “Two Betrayals” on Heroic difficulty or higher without killing any Grunts.
Unlocked: 23 Nov 2011 20:17:26
The Library
25Complete the level “The Library” on any difficulty.
Unlocked: 23 Nov 2011 19:25:24
Speed Reader
25Complete the level “The Library” on Legendary difficulty in 30 minutes or less.
Unlocked: 23 Nov 2011 19:24:14
Complete the level “343 Guilty Spark” on any difficulty.
Unlocked: 23 Nov 2011 18:26:17
Kill 50 Flood Combat Forms on the level “343 Guilty Spark” on Heroic difficulty or higher.
Unlocked: 23 Nov 2011 18:11:51
Complete the level “Truth and Reconciliation” with at least four rounds left in your Sniper Rifle.
Unlocked: 22 Nov 2011 23:46:55
No-Fly Zone
10Destroy three of the four Banshees on “Halo” on any difficulty during a single play-through.
Unlocked: 22 Nov 2011 23:12:35
Complete the level “Assault on the Control Room” on any difficulty.
Unlocked: 22 Nov 2011 21:35:10
Read half the terminals hidden throughout the campaign.
Unlocked: 22 Nov 2011 21:30:49
Pilot a Banshee on the level “Assault on the Control Room.”
Unlocked: 22 Nov 2011 21:26:08
Destroy four Wraith tanks in “Assault on the Control Room” with the Scorpion tank, in a single play.
Unlocked: 22 Nov 2011 21:05:02
Locate half of the skulls hidden throughout the campaign.
Unlocked: 22 Nov 2011 20:44:36
Complete the level “The Silent Cartographer” on any difficulty.
Unlocked: 22 Nov 2011 20:33:43
Grenadier
25Escape the map room in “The Silent Cartographer” without firing a shot on Heroic or Legendary.
Unlocked: 22 Nov 2011 20:33:43
Beachhead
10Storm the beach of “The Silent Cartographer” with no marine casualties on Heroic or Legendary.
Unlocked: 22 Nov 2011 19:58:33
Complete the level “Truth and Reconciliation” on any difficulty.
Unlocked: 22 Nov 2011 19:54:37
Tsantsa
50Complete any level with at least three skulls active on Heroic difficulty or higher.
Unlocked: 22 Nov 2011 19:54:37
Kill all the enemies in the first encounter of “Truth and Reconciliation” without being detected.
Unlocked: 21 Nov 2011 20:09:01
Halo
25Complete the level “Halo” on any difficulty.
Unlocked: 21 Nov 2011 19:36:37
Complete the level “Halo” on any difficulty without entering a vehicle.
Unlocked: 21 Nov 2011 19:36:37
Complete the level “Pillar of Autumn” on any difficulty.
Unlocked: 21 Nov 2011 18:58:23
Complete any level on Normal difficulty cooperatively.
Unlocked: 21 Nov 2011 18:58:23
Brovershield
20Complete any level on Heroic difficulty cooperatively.
Unlocked: 21 Nov 2011 18:58:23
Bro Hammer
50Complete any level on Legendary difficulty cooperatively.
Unlocked: 21 Nov 2011 18:58:23
Complete any level on Heroic difficulty or higher without taking health damage.
Unlocked: 21 Nov 2011 18:58:23
Complete the level “Pillar of Autumn” on Legendary without picking up an Overshield.
Unlocked: 21 Nov 2011 18:58:23
Walk it Off
25Complete the level “Pillar of Autumn” on Legendary without picking up a health kit.
Unlocked: 21 Nov 2011 18:58:23
Read a terminal.
Unlocked: 21 Nov 2011 18:38:31
Find your first campaign skull.
Unlocked: 21 Nov 2011 18:33:52