In Firefight, on any mission, pass the 4th Set on 4-player Heroic LIVE co-op.
Unlocked: 10 Oct 2009 12:16:19
Score over 200,000 points in Firefight on Chasm Ten.
Unlocked: 04 Oct 2009 20:45:09
Score over 200,000 points in Firefight on Security Zone.
Unlocked: 04 Oct 2009 13:54:19
Score over 200,000 points in Firefight on Last Exit.
Unlocked: 03 Oct 2009 14:52:48
Score over 200,000 points in Firefight on Rally Point.
Unlocked: 03 Oct 2009 12:53:49
Score over 200,000 points in Firefight on Windward.
Unlocked: 02 Oct 2009 19:29:48
Complete the Campaign on Legendary to unlock a new Firefight character.
Unlocked: 30 Sep 2009 20:15:33
Complete the Campaign on Heroic difficulty.
Unlocked: 30 Sep 2009 20:15:32
Killing things that are new and different is bad, alone or with another ODST.
Unlocked: 30 Sep 2009 19:44:42
Audiophile
75Find all Audio Logs, alone or with another ODST.
Unlocked: 30 Sep 2009 16:13:56
Score over 200,000 points in Firefight on Lost Platoon.
Unlocked: 28 Sep 2009 22:15:02
Killing things that are new and different is good, alone or with another ODST.
Unlocked: 28 Sep 2009 15:59:01
Complete Highway on 4-player Legendary LIVE co-op, with Iron, and no 'Hog or Scorpion.
Unlocked: 27 Sep 2009 22:45:10
Score over 200,000 points in Firefight on Alpha Site.
Unlocked: 27 Sep 2009 21:08:33
Finish any level solo on Legendary, on LIVE, with no shots fired or grenades thrown.
Unlocked: 27 Sep 2009 11:10:06
Stun a vehicle with an overcharged plasma pistol and quickly kill the driver.
Unlocked: 27 Sep 2009 10:53:53
Plasma Pistol Overcharge and quickly kill 10 Brutes.
Unlocked: 27 Sep 2009 09:38:21
Kill 10 enemies with the Flamethrower on Data Hive.
Unlocked: 27 Sep 2009 09:35:10
Get 10 Spartan Laser kills on ONI Alpha Site.
Unlocked: 27 Sep 2009 09:22:41
Kill all Wraiths in Uplift Reserve.
Unlocked: 27 Sep 2009 08:58:10
All Ears
30Find 15 Audio Logs, alone or with another ODST.
Unlocked: 26 Sep 2009 19:26:37
Headcase
5Finish any level with at least one Skull activated.
Unlocked: 26 Sep 2009 18:29:57
Complete the Campaign on Normal difficulty.
Unlocked: 25 Sep 2009 23:11:26
Tayari Plaza
30Complete Tayari Plaza on Normal, Heroic, or Legendary to unlock a new Firefight character.
Unlocked: 25 Sep 2009 23:11:25
Complete Coastal Highway on Normal, Heroic, or Legendary to unlock a new Firefight mission.
Unlocked: 25 Sep 2009 22:56:24
Data Hive
50Complete Data Hive on Normal, Heroic, or Legendary to unlock a new Firefight mission.
Unlocked: 25 Sep 2009 22:29:55
Complete Kikowani Station on Normal, Heroic, or Legendary.
Unlocked: 25 Sep 2009 22:02:25
Super Sleuth
10Find the final clue unraveling the mystery, alone or with another ODST.
Unlocked: 25 Sep 2009 21:44:27
NMPD HQ
30Complete NMPD HQ on Normal, Heroic, or Legendary to unlock a new Firefight character.
Unlocked: 24 Sep 2009 22:02:17
Get 15 headshot kills on NMPD HQ.
Unlocked: 24 Sep 2009 21:51:32
Complete ONI Alpha Site on Normal, Heroic, or Legendary to unlock a new Firefight mission.
Unlocked: 24 Sep 2009 21:38:55
Complete Kizingo Blvd. on Normal, Heroic, or Legendary to unlock a new Firefight character.
Unlocked: 24 Sep 2009 21:16:25
Get 10 Rocket kills on Kizingo Boulevard.
Unlocked: 24 Sep 2009 21:05:21
Gumshoe
10Find the 3rd clue unraveling the mystery, alone or with another ODST.
Unlocked: 24 Sep 2009 20:58:47
Tuned In
15Find 3 Audio Logs, alone or with another ODST.
Unlocked: 24 Sep 2009 20:13:18
Score over 200,000 points in Firefight on Crater.
Unlocked: 23 Sep 2009 17:55:55
In Firefight, finish a full round without killing a single enemy.
Unlocked: 23 Sep 2009 16:03:07
Get 5 sticky grenade kills in any level.
Unlocked: 22 Sep 2009 21:10:13
Complete Uplift Reserve on Normal, Heroic, or Legendary to unlock a new Firefight character.
Unlocked: 22 Sep 2009 17:11:09
Listener
5Find the first Audio Log.
Unlocked: 22 Sep 2009 16:39:15
Get 10 Needler supercombine kills on any covenant.
Unlocked: 22 Sep 2009 16:29:40
Trade weapons with a fellow character.
Unlocked: 22 Sep 2009 16:15:01
Find the first clue unraveling the mystery.
Unlocked: 22 Sep 2009 16:13:37
Kill 5 enemies while using VISR mode.
Unlocked: 22 Sep 2009 16:10:01
Tourist
5Access and download the city map to your VISR.
Unlocked: 22 Sep 2009 16:06:13
Get 10 automag headshot kills in any level.
Unlocked: 22 Sep 2009 10:41:16
Heal Up
5Find the first Medical Kiosk and heal yourself.
Unlocked: 22 Sep 2009 10:39:39