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

Unlocked: 08 Jun 2013 03:17:16

Complete the Campaign on Normal difficulty.

Unlocked: 08 Jun 2013 03:17:16

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

Unlocked: 08 Jun 2013 02:24:08

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

Unlocked: 08 Jun 2013 01:36:12

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

Unlocked: 08 Jun 2013 01:29:45

Get 10 automag headshot kills in any level.

Unlocked: 08 Jun 2013 01:15:43

Get 15 headshot kills on NMPD HQ.

Unlocked: 08 Jun 2013 01:07:21

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

Unlocked: 08 Jun 2013 00:58:23

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

Unlocked: 06 Jun 2013 02:56:35

Get 10 Needler supercombine kills on any covenant.

Unlocked: 06 Jun 2013 01:59:55

Trade weapons with a fellow character.

Unlocked: 05 Jun 2013 03:26:49

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

Unlocked: 05 Jun 2013 03:18:05

Find 3 Audio Logs, alone or with another ODST.

Unlocked: 04 Jun 2013 01:04:33

Complete Kikowani Station on Normal, Heroic, or Legendary.

Unlocked: 04 Jun 2013 00:55:37

Get 5 sticky grenade kills in any level.

Unlocked: 04 Jun 2013 00:40:12

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

Unlocked: 04 Jun 2013 00:25:32

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

Unlocked: 03 Jun 2013 03:21:01

Find the first Audio Log.

Unlocked: 02 Jun 2013 02:01:27

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

Unlocked: 02 Jun 2013 01:38:40

Find the first clue unraveling the mystery.

Unlocked: 02 Jun 2013 01:04:40

Access and download the city map to your VISR.

Unlocked: 02 Jun 2013 00:50:46

Kill 5 enemies while using VISR mode.

Unlocked: 02 Jun 2013 00:48:06

Find the first Medical Kiosk and heal yourself.

Unlocked: 02 Jun 2013 00:42:18

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

Plasma Pistol Overcharge and quickly kill 10 Brutes.

Finish any level with at least one Skull activated.

Complete the Campaign on Heroic difficulty.

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

Kill all Wraiths in Uplift Reserve.

Get 10 Rocket kills on Kizingo Boulevard.

Get 10 Spartan Laser kills on ONI Alpha Site.

Kill 10 enemies with the Flamethrower on Data Hive.

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

Find 15 Audio Logs, alone or with another ODST.

Find all Audio Logs, alone or with another ODST.

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

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 Alpha Site.

Score over 200,000 points in Firefight on Windward.

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

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

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

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.