Complete the level “The Library” on Heroic difficulty or higher without dying.
Unlocked: 30 Dec 2011 06:02:52
Speed Reader
25Complete the level “The Library” on Legendary difficulty in 30 minutes or less.
Unlocked: 30 Dec 2011 00:57:53
Tsantsa
50Complete any level with at least three skulls active on Heroic difficulty or higher.
Unlocked: 30 Dec 2011 00:29:00
Escape the Forerunner facility on the level “343 Guilty Spark” in 21 minutes or less.
Unlocked: 30 Dec 2011 00:12:57
Headhunter
50Locate all the skulls hidden throughout the campaign.
Unlocked: 30 Dec 2011 00:00:43
Complete the level “Two Betrayals” on Legendary difficulty without picking up a new weapon.
Unlocked: 29 Dec 2011 23:25:28
Complete the level “Two Betrayals” on Heroic difficulty or higher without killing any Grunts.
Unlocked: 29 Dec 2011 22:28:39
The Maw
25Complete the level “The Maw” on any difficulty.
Unlocked: 29 Dec 2011 00:43:06
Complete every level of the game on Normal difficulty.
Unlocked: 29 Dec 2011 00:43:06
Complete every level of the game on Heroic difficulty.
Unlocked: 29 Dec 2011 00:43:06
Complete every level of the game on Legendary difficulty.
Unlocked: 29 Dec 2011 00:43:06
This Side Up
10Complete the Warthog ride on the level “The Maw” without being forcibly ejected from your vehicle.
Unlocked: 29 Dec 2011 00:39:54
Escape “The Maw” on Legendary with at least a minute left on the count down.
Unlocked: 29 Dec 2011 00:39:54
Read all of the terminals hidden throughout the campaign.
Unlocked: 29 Dec 2011 00:09:46
Keyes
25Complete the level “Keyes” on any difficulty.
Unlocked: 28 Dec 2011 23:53:52
Kill every Elite on the level “Keyes” on Heroic difficulty or above.
Unlocked: 28 Dec 2011 23:53:28
Popcorn.gif
25Kill 100 Flood Infection Forms on the level “Keyes” on Heroic difficulty or above.
Unlocked: 28 Dec 2011 23:16:23
Complete the level “Two Betrayals” on any difficulty.
Unlocked: 27 Dec 2011 22:46:04
The Library
25Complete the level “The Library” on any difficulty.
Unlocked: 27 Dec 2011 21:19:37
Complete the level “343 Guilty Spark” on any difficulty.
Unlocked: 27 Dec 2011 20:16:09
Kill 50 Flood Combat Forms on the level “343 Guilty Spark” on Heroic difficulty or higher.
Unlocked: 27 Dec 2011 20:15:03
Destroy four Wraith tanks in “Assault on the Control Room” with the Scorpion tank, in a single play.
Unlocked: 27 Dec 2011 19:21:34
Complete the level “Assault on the Control Room” on any difficulty.
Unlocked: 26 Dec 2011 21:36:43
Read half the terminals hidden throughout the campaign.
Unlocked: 26 Dec 2011 21:24:59
Pilot a Banshee on the level “Assault on the Control Room.”
Unlocked: 26 Dec 2011 21:23:11
Locate half of the skulls hidden throughout the campaign.
Unlocked: 26 Dec 2011 20:19:27
Complete the level “Halo” on any difficulty without entering a vehicle.
Unlocked: 26 Dec 2011 18:38:38
No-Fly Zone
10Destroy three of the four Banshees on “Halo” on any difficulty during a single play-through.
Unlocked: 26 Dec 2011 18:30:36
Complete any level on Heroic difficulty or higher without taking health damage.
Unlocked: 26 Dec 2011 18:00:15
Complete the level “Pillar of Autumn” on Legendary without picking up an Overshield.
Unlocked: 26 Dec 2011 18:00:15
Walk it Off
25Complete the level “Pillar of Autumn” on Legendary without picking up a health kit.
Unlocked: 26 Dec 2011 18:00:15
Find your first campaign skull.
Unlocked: 26 Dec 2011 17:21:26
Complete the level “The Silent Cartographer” on any difficulty.
Unlocked: 26 Dec 2011 01:47:08
Grenadier
25Escape the map room in “The Silent Cartographer” without firing a shot on Heroic or Legendary.
Unlocked: 26 Dec 2011 01:47:07
Beachhead
10Storm the beach of “The Silent Cartographer” with no marine casualties on Heroic or Legendary.
Unlocked: 26 Dec 2011 00:52:24
Kill all the enemies in the first encounter of “Truth and Reconciliation” without being detected.
Unlocked: 26 Dec 2011 00:50:00
Halo
25Complete the level “Halo” on any difficulty.
Unlocked: 25 Dec 2011 01:49:29
Complete the level “Pillar of Autumn” on any difficulty.
Unlocked: 24 Dec 2011 23:41:16
Complete any level on Normal difficulty cooperatively.
Unlocked: 24 Dec 2011 23:41:15
Brovershield
20Complete any level on Heroic difficulty cooperatively.
Unlocked: 24 Dec 2011 23:41:15
Bro Hammer
50Complete any level on Legendary difficulty cooperatively.
Unlocked: 24 Dec 2011 23:41:15
Read a terminal.
Unlocked: 24 Dec 2011 23:20:12
Complete the level “Truth and Reconciliation” on any difficulty.
Unlocked: Offline
Complete the level “Truth and Reconciliation” with at least four rounds left in your Sniper Rifle.
Unlocked: Offline