In Firefight, on any mission, pass the 4th Set on 4-player Heroic LIVE co-op.
Unlocked: 05 Apr 2011 23:15:15
Complete Highway on 4-player Legendary LIVE co-op, with Iron, and no 'Hog or Scorpion.
Unlocked: 14 Feb 2010 23:03:41
Score over 200,000 points in Firefight on Last Exit.
Unlocked: 11 Dec 2009 18:14:09
Score over 200,000 points in Firefight on Alpha Site.
Unlocked: 06 Dec 2009 03:01:14
Score over 200,000 points in Firefight on Security Zone.
Unlocked: 06 Dec 2009 01:26:51
Score over 200,000 points in Firefight on Rally Point.
Unlocked: 05 Dec 2009 00:47:28
Score over 200,000 points in Firefight on Lost Platoon.
Unlocked: 04 Dec 2009 21:20:18
Score over 200,000 points in Firefight on Crater.
Unlocked: 03 Dec 2009 19:09:17
Complete the Campaign on Legendary to unlock a new Firefight character.
Unlocked: 03 Dec 2009 15:54:16
Finish any level solo on Legendary, on LIVE, with no shots fired or grenades thrown.
Unlocked: 20 Oct 2009 21:24:33
Complete the Campaign on Heroic difficulty.
Unlocked: 20 Oct 2009 20:51:27
Score over 200,000 points in Firefight on Windward.
Unlocked: 18 Oct 2009 17:39:01
In Firefight, finish a full round without killing a single enemy.
Unlocked: 18 Oct 2009 17:31:34
Killing things that are new and different is good, alone or with another ODST.
Unlocked: 18 Oct 2009 15:07:41
Headcase
5Finish any level with at least one Skull activated.
Unlocked: 18 Oct 2009 14:18:45
Plasma Pistol Overcharge and quickly kill 10 Brutes.
Unlocked: 18 Oct 2009 13:58:27
Complete the Campaign on Normal difficulty.
Unlocked: 18 Oct 2009 02:57:03
Complete Coastal Highway on Normal, Heroic, or Legendary to unlock a new Firefight mission.
Unlocked: 18 Oct 2009 02:57:02
Data Hive
50Complete Data Hive on Normal, Heroic, or Legendary to unlock a new Firefight mission.
Unlocked: 18 Oct 2009 02:13:57
Kill 10 enemies with the Flamethrower on Data Hive.
Unlocked: 18 Oct 2009 01:50:27
Audiophile
75Find all Audio Logs, alone or with another ODST.
Unlocked: 18 Oct 2009 01:46:19
Killing things that are new and different is bad, alone or with another ODST.
Unlocked: 18 Oct 2009 01:27:33
Complete Kikowani Station on Normal, Heroic, or Legendary.
Unlocked: 18 Oct 2009 01:19:43
Super Sleuth
10Find the final clue unraveling the mystery, alone or with another ODST.
Unlocked: 17 Oct 2009 23:18:57
NMPD HQ
30Complete NMPD HQ on Normal, Heroic, or Legendary to unlock a new Firefight character.
Unlocked: 17 Oct 2009 17:58:12
Get 15 headshot kills on NMPD HQ.
Unlocked: 17 Oct 2009 17:29:03
Complete ONI Alpha Site on Normal, Heroic, or Legendary to unlock a new Firefight mission.
Unlocked: 17 Oct 2009 16:27:47
Get 10 Spartan Laser kills on ONI Alpha Site.
Unlocked: 17 Oct 2009 16:02:32
Complete Kizingo Blvd. on Normal, Heroic, or Legendary to unlock a new Firefight character.
Unlocked: 17 Oct 2009 15:03:51
Get 10 Rocket kills on Kizingo Boulevard.
Unlocked: 17 Oct 2009 14:43:20
Gumshoe
10Find the 3rd clue unraveling the mystery, alone or with another ODST.
Unlocked: 17 Oct 2009 14:37:30
All Ears
30Find 15 Audio Logs, alone or with another ODST.
Unlocked: 17 Oct 2009 01:49:11
Complete Uplift Reserve on Normal, Heroic, or Legendary to unlock a new Firefight character.
Unlocked: 14 Oct 2009 19:08:52
Kill all Wraiths in Uplift Reserve.
Unlocked: 14 Oct 2009 19:04:20
Stun a vehicle with an overcharged plasma pistol and quickly kill the driver.
Unlocked: 14 Oct 2009 18:30:46
Trade weapons with a fellow character.
Unlocked: 14 Oct 2009 18:27:24
Tuned In
15Find 3 Audio Logs, alone or with another ODST.
Unlocked: 12 Oct 2009 23:46:29
Listener
5Find the first Audio Log.
Unlocked: 12 Oct 2009 23:12:53
Tayari Plaza
30Complete Tayari Plaza on Normal, Heroic, or Legendary to unlock a new Firefight character.
Unlocked: 12 Oct 2009 22:57:26
Get 5 sticky grenade kills in any level.
Unlocked: 12 Oct 2009 22:48:23
Get 10 Needler supercombine kills on any covenant.
Unlocked: 12 Oct 2009 22:35:30
Find the first clue unraveling the mystery.
Unlocked: 12 Oct 2009 22:08:48
Tourist
5Access and download the city map to your VISR.
Unlocked: 12 Oct 2009 21:55:42
Get 10 automag headshot kills in any level.
Unlocked: 12 Oct 2009 21:51:26
Kill 5 enemies while using VISR mode.
Unlocked: 12 Oct 2009 21:48:00
Heal Up
5Find the first Medical Kiosk and heal yourself.
Unlocked: 12 Oct 2009 21:41:34
Score over 200,000 points in Firefight on Chasm Ten.
Unlocked: Offline