Complete the level “The Library” on Heroic difficulty or higher without dying.
Unlocked: 1 Aug 2012 07:43 am
Halo
25Complete the level “Halo” on any difficulty.
Unlocked: 6 Jan 2012 07:58 pm
Complete the level “Pillar of Autumn” on any difficulty.
Unlocked: 6 Jan 2012 05:51 pm
Complete any level on Normal difficulty cooperatively.
Unlocked: 6 Jan 2012 05:51 pm
Brovershield
20Complete any level on Heroic difficulty cooperatively.
Unlocked: 6 Jan 2012 05:51 pm
Bro Hammer
50Complete any level on Legendary difficulty cooperatively.
Unlocked: 6 Jan 2012 05:51 pm
Complete the level “Pillar of Autumn” on Legendary without picking up an Overshield.
Unlocked: 6 Jan 2012 05:51 pm
Walk it Off
25Complete the level “Pillar of Autumn” on Legendary without picking up a health kit.
Unlocked: 6 Jan 2012 05:51 pm
Read a terminal.
Unlocked: 6 Jan 2012 05:29 pm
Find your first campaign skull.
Unlocked: 6 Jan 2012 05:21 pm
Complete the level “The Silent Cartographer” on any difficulty.
Unlocked: Offline
Complete the level “Assault on the Control Room” on any difficulty.
Unlocked: Offline
Complete the level “Truth and Reconciliation” on any difficulty.
Unlocked: Offline
Complete the level “343 Guilty Spark” on any difficulty.
Unlocked: Offline
The Library
25Complete the level “The Library” on any difficulty.
Unlocked: Offline
Complete the level “Two Betrayals” on any difficulty.
Unlocked: Offline
Keyes
25Complete the level “Keyes” on any difficulty.
Unlocked: Offline
The Maw
25Complete the level “The Maw” on any difficulty.
Unlocked: Offline
Tsantsa
50Complete any level with at least three skulls active on Heroic difficulty or higher.
Unlocked: Offline
Read half the terminals hidden throughout the campaign.
Unlocked: Offline
Read all of the terminals hidden throughout the campaign.
Unlocked: Offline
Locate half of the skulls hidden throughout the campaign.
Unlocked: Offline
Headhunter
50Locate all the skulls hidden throughout the campaign.
Unlocked: Offline
Complete every level of the game on Normal difficulty.
Unlocked: Offline
Complete every level of the game on Heroic difficulty.
Unlocked: Offline
Complete every level of the game on Legendary difficulty.
Unlocked: Offline
Complete any level on Heroic difficulty or higher without taking health damage.
Unlocked: Offline
No-Fly Zone
10Destroy three of the four Banshees on “Halo” on any difficulty during a single play-through.
Unlocked: Offline
Complete the level “Halo” on any difficulty without entering a vehicle.
Unlocked: Offline
Complete the level “Truth and Reconciliation” with at least four rounds left in your Sniper Rifle.
Unlocked: Offline
Pilot a Banshee on the level “Assault on the Control Room.”
Unlocked: Offline
Kill 50 Flood Combat Forms on the level “343 Guilty Spark” on Heroic difficulty or higher.
Unlocked: Offline
Speed Reader
25Complete the level “The Library” on Legendary difficulty in 30 minutes or less.
Unlocked: Offline
Complete the level “Two Betrayals” on Heroic difficulty or higher without killing any Grunts.
Unlocked: Offline
Complete the level “Two Betrayals” on Legendary difficulty without picking up a new weapon.
Unlocked: Offline
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25Kill 100 Flood Infection Forms on the level “Keyes” on Heroic difficulty or above.
Unlocked: Offline
Kill all the enemies in the first encounter of “Truth and Reconciliation” without being detected.
Unlocked: Offline
Beachhead
10Storm the beach of “The Silent Cartographer” with no marine casualties on Heroic or Legendary.
Unlocked: Offline
Grenadier
25Escape the map room in “The Silent Cartographer” without firing a shot on Heroic or Legendary.
Unlocked: Offline
Destroy four Wraith tanks in “Assault on the Control Room” with the Scorpion tank, in a single play.
Unlocked: Offline
Escape the Forerunner facility on the level “343 Guilty Spark” in 21 minutes or less.
Unlocked: Offline
Kill every Elite on the level “Keyes” on Heroic difficulty or above.
Unlocked: Offline
This Side Up
10Complete the Warthog ride on the level “The Maw” without being forcibly ejected from your vehicle.
Unlocked: Offline
Escape “The Maw” on Legendary with at least a minute left on the count down.
Unlocked: Offline