Complete Highway on 4-player Legendary LIVE co-op, with Iron, and no 'Hog or Scorpion.
Unlocked: 11 Jul 2010 06:09:46
In Firefight, on any mission, pass the 4th Set on 4-player Heroic LIVE co-op.
Unlocked: 11 Jul 2010 04:49:01
In Firefight, finish a full round without killing a single enemy.
Unlocked: 05 Nov 2009 22:59:19
Score over 200,000 points in Firefight on Security Zone.
Unlocked: 05 Nov 2009 02:47:22
Score over 200,000 points in Firefight on Windward.
Unlocked: 04 Nov 2009 01:28:44
Score over 200,000 points in Firefight on Chasm Ten.
Unlocked: 03 Nov 2009 01:15:18
Score over 200,000 points in Firefight on Last Exit.
Unlocked: 02 Nov 2009 00:05:56
Score over 200,000 points in Firefight on Lost Platoon.
Unlocked: 01 Nov 2009 03:01:10
Score over 200,000 points in Firefight on Rally Point.
Unlocked: 30 Oct 2009 00:19:33
Score over 200,000 points in Firefight on Alpha Site.
Unlocked: 28 Oct 2009 00:58:34
Score over 200,000 points in Firefight on Crater.
Unlocked: 27 Oct 2009 02:13:04
Stun a vehicle with an overcharged plasma pistol and quickly kill the driver.
Unlocked: 03 Oct 2009 02:43:27
Complete the Campaign on Legendary to unlock a new Firefight character.
Unlocked: 27 Sep 2009 20:12:08
Audiophile
75Find all Audio Logs, alone or with another ODST.
Unlocked: 27 Sep 2009 18:52:28
Super Sleuth
10Find the final clue unraveling the mystery, alone or with another ODST.
Unlocked: 27 Sep 2009 17:58:12
Killing things that are new and different is good, alone or with another ODST.
Unlocked: 27 Sep 2009 17:18:44
All Ears
30Find 15 Audio Logs, alone or with another ODST.
Unlocked: 26 Sep 2009 22:12:57
Headcase
5Finish any level with at least one Skull activated.
Unlocked: 25 Sep 2009 04:16:16
Get 10 Needler supercombine kills on any covenant.
Unlocked: 25 Sep 2009 04:03:29
Kill 10 enemies with the Flamethrower on Data Hive.
Unlocked: 25 Sep 2009 04:00:24
Finish any level solo on Legendary, on LIVE, with no shots fired or grenades thrown.
Unlocked: 24 Sep 2009 22:55:00
Complete Coastal Highway on Normal, Heroic, or Legendary to unlock a new Firefight mission.
Unlocked: 24 Sep 2009 22:45:49
Complete the Campaign on Normal difficulty.
Unlocked: 24 Sep 2009 22:45:49
Complete the Campaign on Heroic difficulty.
Unlocked: 24 Sep 2009 22:45:49
Data Hive
50Complete Data Hive on Normal, Heroic, or Legendary to unlock a new Firefight mission.
Unlocked: 24 Sep 2009 21:55:41
Killing things that are new and different is bad, alone or with another ODST.
Unlocked: 24 Sep 2009 21:15:00
Complete Kikowani Station on Normal, Heroic, or Legendary.
Unlocked: 24 Sep 2009 19:09:23
NMPD HQ
30Complete NMPD HQ on Normal, Heroic, or Legendary to unlock a new Firefight character.
Unlocked: 24 Sep 2009 18:35:01
Get 15 headshot kills on NMPD HQ.
Unlocked: 24 Sep 2009 18:15:37
Gumshoe
10Find the 3rd clue unraveling the mystery, alone or with another ODST.
Unlocked: 24 Sep 2009 00:17:02
Complete ONI Alpha Site on Normal, Heroic, or Legendary to unlock a new Firefight mission.
Unlocked: 24 Sep 2009 00:08:01
Get 10 Spartan Laser kills on ONI Alpha Site.
Unlocked: 23 Sep 2009 23:52:30
Plasma Pistol Overcharge and quickly kill 10 Brutes.
Unlocked: 23 Sep 2009 23:08:29
Complete Kizingo Blvd. on Normal, Heroic, or Legendary to unlock a new Firefight character.
Unlocked: 23 Sep 2009 22:34:45
Trade weapons with a fellow character.
Unlocked: 23 Sep 2009 22:24:35
Get 10 Rocket kills on Kizingo Boulevard.
Unlocked: 23 Sep 2009 22:16:58
Tuned In
15Find 3 Audio Logs, alone or with another ODST.
Unlocked: 23 Sep 2009 21:12:25
Complete Uplift Reserve on Normal, Heroic, or Legendary to unlock a new Firefight character.
Unlocked: 23 Sep 2009 21:07:46
Kill all Wraiths in Uplift Reserve.
Unlocked: 23 Sep 2009 21:05:37
Listener
5Find the first Audio Log.
Unlocked: 23 Sep 2009 20:33:37
Tayari Plaza
30Complete Tayari Plaza on Normal, Heroic, or Legendary to unlock a new Firefight character.
Unlocked: 23 Sep 2009 20:23:50
Get 5 sticky grenade kills in any level.
Unlocked: 23 Sep 2009 20:08:25
Find the first clue unraveling the mystery.
Unlocked: 23 Sep 2009 20:00:22
Tourist
5Access and download the city map to your VISR.
Unlocked: 23 Sep 2009 19:50:41
Get 10 automag headshot kills in any level.
Unlocked: 23 Sep 2009 19:47:27
Kill 5 enemies while using VISR mode.
Unlocked: 23 Sep 2009 19:47:04
Heal Up
5Find the first Medical Kiosk and heal yourself.
Unlocked: 23 Sep 2009 19:42:39