Complete the level “Two Betrayals” on Heroic difficulty or higher without killing any Grunts.
Unlocked: 05 Apr 2012 10:09:06
Complete the level “Two Betrayals” on Legendary difficulty without picking up a new weapon.
Unlocked: 05 Apr 2012 10:09:06
Complete any level on Heroic difficulty or higher without taking health damage.
Unlocked: 04 Apr 2012 21:31:45
Complete the level “The Library” on Heroic difficulty or higher without dying.
Unlocked: 04 Apr 2012 21:31:45
This Side Up
10Complete the Warthog ride on the level “The Maw” without being forcibly ejected from your vehicle.
Unlocked: 04 Apr 2012 20:14:48
Escape “The Maw” on Legendary with at least a minute left on the count down.
Unlocked: 04 Apr 2012 20:14:48
Read all of the terminals hidden throughout the campaign.
Unlocked: 04 Apr 2012 19:04:26
Escape the Forerunner facility on the level “343 Guilty Spark” in 21 minutes or less.
Unlocked: 04 Apr 2012 19:03:30
Kill 50 Flood Combat Forms on the level “343 Guilty Spark” on Heroic difficulty or higher.
Unlocked: 04 Apr 2012 19:02:59
Complete the level “Halo” on any difficulty without entering a vehicle.
Unlocked: 04 Apr 2012 17:39:08
Speed Reader
25Complete the level “The Library” on Legendary difficulty in 30 minutes or less.
Unlocked: 04 Apr 2012 17:09:33
Kill every Elite on the level “Keyes” on Heroic difficulty or above.
Unlocked: 04 Apr 2012 15:59:27
Grenadier
25Escape the map room in “The Silent Cartographer” without firing a shot on Heroic or Legendary.
Unlocked: 04 Apr 2012 15:17:32
Beachhead
10Storm the beach of “The Silent Cartographer” with no marine casualties on Heroic or Legendary.
Unlocked: 04 Apr 2012 14:48:35
Complete every level of the game on Normal difficulty.
Unlocked: 03 Apr 2012 21:44:28
Complete every level of the game on Heroic difficulty.
Unlocked: 03 Apr 2012 21:44:28
Complete every level of the game on Legendary difficulty.
Unlocked: 03 Apr 2012 21:44:28
The Maw
25Complete the level “The Maw” on any difficulty.
Unlocked: 03 Apr 2012 20:31:15
Headhunter
50Locate all the skulls hidden throughout the campaign.
Unlocked: 03 Apr 2012 20:26:07
Keyes
25Complete the level “Keyes” on any difficulty.
Unlocked: 03 Apr 2012 18:18:31
Popcorn.gif
25Kill 100 Flood Infection Forms on the level “Keyes” on Heroic difficulty or above.
Unlocked: 03 Apr 2012 17:51:18
Tsantsa
50Complete any level with at least three skulls active on Heroic difficulty or higher.
Unlocked: 03 Apr 2012 12:50:11
Complete the level “Pillar of Autumn” on Legendary without picking up an Overshield.
Unlocked: 03 Apr 2012 12:50:11
Complete the level “Two Betrayals” on any difficulty.
Unlocked: 02 Apr 2012 15:57:08
The Library
25Complete the level “The Library” on any difficulty.
Unlocked: 02 Apr 2012 14:27:54
Complete the level “343 Guilty Spark” on any difficulty.
Unlocked: 02 Apr 2012 13:20:18
Destroy four Wraith tanks in “Assault on the Control Room” with the Scorpion tank, in a single play.
Unlocked: 02 Apr 2012 10:02:48
Complete the level “Assault on the Control Room” on any difficulty.
Unlocked: 01 Apr 2012 21:52:18
Read half the terminals hidden throughout the campaign.
Unlocked: 01 Apr 2012 21:45:43
Pilot a Banshee on the level “Assault on the Control Room.”
Unlocked: 01 Apr 2012 21:44:33
Locate half of the skulls hidden throughout the campaign.
Unlocked: 01 Apr 2012 20:11:03
Complete the level “The Silent Cartographer” on any difficulty.
Unlocked: 01 Apr 2012 19:14:02
Complete the level “Truth and Reconciliation” on any difficulty.
Unlocked: 01 Apr 2012 17:44:27
Complete the level “Truth and Reconciliation” with at least four rounds left in your Sniper Rifle.
Unlocked: 01 Apr 2012 17:44:27
Kill all the enemies in the first encounter of “Truth and Reconciliation” without being detected.
Unlocked: 01 Apr 2012 16:24:22
Halo
25Complete the level “Halo” on any difficulty.
Unlocked: 01 Apr 2012 16:15:22
No-Fly Zone
10Destroy three of the four Banshees on “Halo” on any difficulty during a single play-through.
Unlocked: 01 Apr 2012 15:58:57
Complete the level “Pillar of Autumn” on any difficulty.
Unlocked: 01 Apr 2012 15:08:12
Complete any level on Normal difficulty cooperatively.
Unlocked: 01 Apr 2012 15:08:12
Brovershield
20Complete any level on Heroic difficulty cooperatively.
Unlocked: 01 Apr 2012 15:08:12
Bro Hammer
50Complete any level on Legendary difficulty cooperatively.
Unlocked: 01 Apr 2012 15:08:12
Walk it Off
25Complete the level “Pillar of Autumn” on Legendary without picking up a health kit.
Unlocked: 01 Apr 2012 15:08:12
Read a terminal.
Unlocked: 01 Apr 2012 14:47:06
Find your first campaign skull.
Unlocked: 01 Apr 2012 14:45:37