Score over 200,000 points in Firefight on Chasm Ten.

Unlocked: 30 Oct 2011 02:14:32

Score over 200,000 points in Firefight on Alpha Site.

Unlocked: 24 Aug 2010 21:03:22

Finish any level solo on Legendary, on LIVE, with no shots fired or grenades thrown.

Unlocked: 26 Jun 2010 00:57:45

Get 5 sticky grenade kills in any level.

Unlocked: 31 Mar 2010 16:28:07

Complete Tayari Plaza on Normal, Heroic, or Legendary to unlock a new Firefight character.

Unlocked: 28 Mar 2010 22:32:14

Trade weapons with a fellow character.

Unlocked: 28 Mar 2010 22:19:39

Find the first clue unraveling the mystery.

Unlocked: 28 Mar 2010 22:11:31

Get 10 automag headshot kills in any level.

Unlocked: 28 Mar 2010 22:06:03

Access and download the city map to your VISR.

Unlocked: 28 Mar 2010 22:03:11

Kill 5 enemies while using VISR mode.

Unlocked: 28 Mar 2010 21:59:16

Find the first Medical Kiosk and heal yourself.

Unlocked: 28 Mar 2010 21:55:35

Stun a vehicle with an overcharged plasma pistol and quickly kill the driver.

Unlocked: Offline

Plasma Pistol Overcharge and quickly kill 10 Brutes.

Unlocked: Offline

Get 10 Needler supercombine kills on any covenant.

Unlocked: Offline

Finish any level with at least one Skull activated.

Unlocked: Offline

Complete Uplift Reserve on Normal, Heroic, or Legendary to unlock a new Firefight character.

Unlocked: Offline

Complete Kizingo Blvd. on Normal, Heroic, or Legendary to unlock a new Firefight character.

Unlocked: Offline

Complete ONI Alpha Site on Normal, Heroic, or Legendary to unlock a new Firefight mission.

Unlocked: Offline

Complete NMPD HQ on Normal, Heroic, or Legendary to unlock a new Firefight character.

Unlocked: Offline

Complete Kikowani Station on Normal, Heroic, or Legendary.

Unlocked: Offline

Complete Data Hive on Normal, Heroic, or Legendary to unlock a new Firefight mission.

Unlocked: Offline

Complete Coastal Highway on Normal, Heroic, or Legendary to unlock a new Firefight mission.

Unlocked: Offline

Complete the Campaign on Normal difficulty.

Unlocked: Offline

Complete the Campaign on Heroic difficulty.

Unlocked: Offline

Complete the Campaign on Legendary to unlock a new Firefight character.

Unlocked: Offline

Find the 3rd clue unraveling the mystery, alone or with another ODST.

Unlocked: Offline

Find the final clue unraveling the mystery, alone or with another ODST.

Unlocked: Offline

Kill all Wraiths in Uplift Reserve.

Unlocked: Offline

Get 10 Rocket kills on Kizingo Boulevard.

Unlocked: Offline

Get 10 Spartan Laser kills on ONI Alpha Site.

Unlocked: Offline

Get 15 headshot kills on NMPD HQ.

Unlocked: Offline

Kill 10 enemies with the Flamethrower on Data Hive.

Unlocked: Offline

Killing things that are new and different is bad, alone or with another ODST.

Unlocked: Offline

Killing things that are new and different is good, alone or with another ODST.

Unlocked: Offline

Find the first Audio Log.

Unlocked: Offline

Find 3 Audio Logs, alone or with another ODST.

Unlocked: Offline

Find 15 Audio Logs, alone or with another ODST.

Unlocked: Offline

Find all Audio Logs, alone or with another ODST.

Unlocked: Offline

In Firefight, finish a full round without killing a single enemy.

Unlocked: Offline

Score over 200,000 points in Firefight on Crater.

Score over 200,000 points in Firefight on Lost Platoon.

Score over 200,000 points in Firefight on Rally Point.

Score over 200,000 points in Firefight on Security Zone.

Score over 200,000 points in Firefight on Windward.

Score over 200,000 points in Firefight on Last Exit.

In Firefight, on any mission, pass the 4th Set on 4-player Heroic LIVE co-op.

Complete Highway on 4-player Legendary LIVE co-op, with Iron, and no 'Hog or Scorpion.