Complete the level “Two Betrayals” on Legendary difficulty without picking up a new weapon.
Unlocked: 09 Mar 2013 17:08:47
Complete the level “Two Betrayals” on Heroic difficulty or higher without killing any Grunts.
Unlocked: 09 Mar 2013 17:08:46
Speed Reader
25Complete the level “The Library” on Legendary difficulty in 30 minutes or less.
Unlocked: 08 Mar 2013 00:10:17
Complete the level “The Library” on Heroic difficulty or higher without dying.
Unlocked: 07 Mar 2013 22:07:38
Escape the Forerunner facility on the level “343 Guilty Spark” in 21 minutes or less.
Unlocked: 06 Mar 2013 21:39:06
Escape “The Maw” on Legendary with at least a minute left on the count down.
Unlocked: 06 Mar 2013 20:58:00
This Side Up
10Complete the Warthog ride on the level “The Maw” without being forcibly ejected from your vehicle.
Unlocked: 05 Mar 2013 22:45:16
Kill every Elite on the level “Keyes” on Heroic difficulty or above.
Unlocked: 04 Mar 2013 21:25:50
Read all of the terminals hidden throughout the campaign.
Unlocked: 03 Mar 2013 22:42:59
Headhunter
50Locate all the skulls hidden throughout the campaign.
Unlocked: 03 Mar 2013 21:45:39
Kill all the enemies in the first encounter of “Truth and Reconciliation” without being detected.
Unlocked: 01 Mar 2013 17:31:09
No-Fly Zone
10Destroy three of the four Banshees on “Halo” on any difficulty during a single play-through.
Unlocked: 01 Mar 2013 17:09:49
Destroy four Wraith tanks in “Assault on the Control Room” with the Scorpion tank, in a single play.
Unlocked: 28 Feb 2013 23:40:33
Grenadier
25Escape the map room in “The Silent Cartographer” without firing a shot on Heroic or Legendary.
Unlocked: 28 Feb 2013 23:10:12
Beachhead
10Storm the beach of “The Silent Cartographer” with no marine casualties on Heroic or Legendary.
Unlocked: 28 Feb 2013 22:26:37
Complete the level “Halo” on any difficulty without entering a vehicle.
Unlocked: 28 Feb 2013 22:15:32
Complete every level of the game on Heroic difficulty.
Unlocked: 28 Feb 2013 21:13:47
Complete every level of the game on Legendary difficulty.
Unlocked: 28 Feb 2013 21:13:47
Complete any level on Heroic difficulty or higher without taking health damage.
Unlocked: 28 Feb 2013 21:13:46
Walk it Off
25Complete the level “Pillar of Autumn” on Legendary without picking up a health kit.
Unlocked: 28 Feb 2013 21:13:46
Tsantsa
50Complete any level with at least three skulls active on Heroic difficulty or higher.
Unlocked: 28 Feb 2013 21:13:45
The Maw
25Complete the level “The Maw” on any difficulty.
Unlocked: 28 Feb 2013 20:45:20
Complete every level of the game on Normal difficulty.
Unlocked: 28 Feb 2013 20:45:20
Keyes
25Complete the level “Keyes” on any difficulty.
Unlocked: 28 Feb 2013 19:44:16
Popcorn.gif
25Kill 100 Flood Infection Forms on the level “Keyes” on Heroic difficulty or above.
Unlocked: 27 Feb 2013 22:41:19
Complete the level “Two Betrayals” on any difficulty.
Unlocked: 27 Feb 2013 22:07:23
Read half the terminals hidden throughout the campaign.
Unlocked: 02 Nov 2012 01:35:18
The Library
25Complete the level “The Library” on any difficulty.
Unlocked: 02 Nov 2012 01:30:40
Locate half of the skulls hidden throughout the campaign.
Unlocked: 02 Nov 2012 01:28:57
Complete the level “343 Guilty Spark” on any difficulty.
Unlocked: 02 Nov 2012 00:05:00
Kill 50 Flood Combat Forms on the level “343 Guilty Spark” on Heroic difficulty or higher.
Unlocked: 02 Nov 2012 00:03:51
Complete the level “Assault on the Control Room” on any difficulty.
Unlocked: 01 Nov 2012 23:10:03
Find your first campaign skull.
Unlocked: 12 Oct 2012 21:17:27
Complete any level on Normal difficulty cooperatively.
Unlocked: 12 Oct 2012 21:01:03
Brovershield
20Complete any level on Heroic difficulty cooperatively.
Unlocked: 12 Oct 2012 21:01:02
Bro Hammer
50Complete any level on Legendary difficulty cooperatively.
Unlocked: 12 Oct 2012 21:01:01
Pilot a Banshee on the level “Assault on the Control Room.”
Unlocked: 08 Oct 2012 21:29:48
Complete the level “The Silent Cartographer” on any difficulty.
Unlocked: 27 Sep 2012 20:11:47
Halo
25Complete the level “Halo” on any difficulty.
Unlocked: 22 Dec 2011 18:46:55
Complete the level “Pillar of Autumn” on any difficulty.
Unlocked: 22 Dec 2011 15:20:24
Complete the level “Pillar of Autumn” on Legendary without picking up an Overshield.
Unlocked: 22 Dec 2011 15:20:23
Complete the level “Truth and Reconciliation” on any difficulty.
Unlocked: Offline
Read a terminal.
Unlocked: Offline
Complete the level “Truth and Reconciliation” with at least four rounds left in your Sniper Rifle.
Unlocked: Offline