Perform an Assassination against an Elite to survive a fall that would've been fatal.
Unlocked: 03 Jun 2012 15:56:32
Complete a Weekly Challenge.
Unlocked: 03 Jun 2012 15:36:45
Complete all of the Daily Challenges in a given day.
Unlocked: 03 Jun 2012 14:16:43
Score Attack
10Score 15,000 points in Score Attack Firefight Matchmaking.
Unlocked: 03 Jun 2012 12:46:05
As an Elite, kill 5 Spartan players in Matchmaking.
Unlocked: 03 Jun 2012 12:33:27
Finish the 9th mission on Legendary with the Scorpion intact.
Unlocked: 03 Jun 2012 03:12:17
Destroy the Corvette's engines & escort in under 3 minutes in the 6th mission on Heroic or harder.
Unlocked: 02 Jun 2012 14:18:26
Kill 10 enemies in Firefight or Campaign with a supercombine explosion.
Unlocked: 01 Jun 2012 18:33:43
Kill the Elite Zealot before he can escape during the 5th mission.
Unlocked: 01 Jun 2012 18:22:52
Clear the 2nd mission without setting foot in a drivable vehicle.
Unlocked: 01 Jun 2012 18:18:06
Kill 7 Moa during the 2nd mission of the Campaign.
Unlocked: 01 Jun 2012 18:14:20
Kill 2 vehicles at once with the Target Locator during the 3rd mission.
Unlocked: 01 Jun 2012 18:08:17
Complete each Campaign Mission on Legendary - alone.
Unlocked: 01 Jun 2012 03:19:09
Complete the Campaign on Legendary difficulty.
Unlocked: 01 Jun 2012 03:19:09
Complete the 10th mission on Normal or harder.
Unlocked: 01 Jun 2012 03:19:09
Complete the Campaign on Heroic difficulty.
Unlocked: 01 Jun 2012 03:19:09
Complete the Campaign on Normal difficulty.
Unlocked: 01 Jun 2012 03:19:09
Complete the 9th mission on Normal or harder.
Unlocked: 31 May 2012 15:04:15
Complete the 8th mission on Normal or harder.
Unlocked: 27 May 2012 14:08:02
Kill 3 of the anti-aircraft batteries during the 8th mission.
Unlocked: 26 May 2012 20:33:01
Hijack a Banshee during the Reach Campaign.
Unlocked: 26 May 2012 20:23:17
Recommend a file to someone.
Unlocked: 26 May 2012 19:43:11
Using the File Browser upload a file to your File Share.
Unlocked: 26 May 2012 19:43:02
Complete the 7th mission on Normal or harder.
Unlocked: 26 May 2012 19:38:46
Kill 10 Enemies in a Firefight or Campaign session with the M6G pistol.
Unlocked: 26 May 2012 15:58:53
Complete the 6th mission on Normal or harder.
Unlocked: 26 May 2012 14:25:33
Swap Meet
10Trade weapons with an AI ally in Campaign.
Unlocked: 26 May 2012 13:30:21
Score 1,000,000 points in Firefight on any map.
Unlocked: 13 May 2012 14:58:50
Complete a Firefight set on Legendary without dying.
Unlocked: 13 May 2012 14:52:40
Score 200,000 points in Firefight on any map.
Unlocked: 12 May 2012 15:11:51
Earn a Killionaire medal in Firefight.
Unlocked: 12 May 2012 15:02:00
Firestarter
10Score 50,000 points in Firefight on any map.
Unlocked: 12 May 2012 14:59:49
Lucky Me
25Earn a Triple Kill while Jetpacking in Campaign, Firefight or Matchmaking.
Unlocked: 12 May 2012 14:56:56
Make It Rain
10Purchase an item from the Armory that requires the rank of Lt. Colonel.
Unlocked: 12 May 2012 14:42:00
Reach the rank of Captain in the UNSC.
Unlocked: 12 May 2012 14:39:50
Advance any Commendation to its Silver state.
Unlocked: 10 May 2012 21:02:32
To War
10Complete the 5th mission on Normal or harder.
Unlocked: 30 Apr 2012 19:43:30
Skunked!
10Win a game of Invasion in the 1st phase.
Unlocked: 30 Apr 2012 01:20:16
Let a teammate spawn on you 5 times in an Invasion Matchmaking game.
Unlocked: 30 Apr 2012 01:19:21
Complete the 4th mission on Normal or harder.
Unlocked: 29 Apr 2012 13:12:57
Complete the 3rd mission on Normal or harder.
Unlocked: 29 Apr 2012 13:00:19
Purchase any item from the Armory.
Unlocked: 29 Apr 2012 12:29:47
Reach the rank of Corporal in the UNSC.
Unlocked: 26 Apr 2012 23:16:05
Earn a Killing Spree in multiplayer Matchmaking.
Unlocked: 26 Apr 2012 22:32:39
Perform an Assassination on an enemy.
Unlocked: 26 Apr 2012 22:32:17
Yes, Sensei
10Earn a First Strike Medal in a Matchmaking game.
Unlocked: 26 Apr 2012 22:06:13
Complete the 2nd mission on Normal or harder.
Unlocked: 26 Apr 2012 21:39:29
Kill 10 enemies in a Firefight or Campaign session with the DMR.
Unlocked: 26 Apr 2012 21:38:19
Use a Health Pack to recover life after taking body damage.
Unlocked: 26 Apr 2012 21:26:03
Noble 1: Earn a kill in a matchmade Rocket Race game.
Unlocked: 26 May 2012 19:56:28
Noble 1: Destroy a vehicle using Armor Lock in a matchmade game.
Unlocked: 30 Apr 2012 01:29:28
Noble 1: Blow up the research facility in a matchmade Invasion game on Breakpoint.
Unlocked: 30 Apr 2012 01:22:36
Noble 1: Collect all of the flags in a matchmade Stockpile game.
Unlocked: 28 Apr 2012 17:57:48
Noble 1: Kill a player at long range with the DMR in a matchmade Slayer game.
Unlocked: 26 Apr 2012 23:52:56
Noble 1: Earn a Double Kill from the Grave in multiplayer Matchmaking.
Unlocked: 26 Apr 2012 23:31:10
Both Barrels
50Noble 1: Earn a Double Kill with the shotgun in multiplayer Matchmaking.
Unlocked: 26 Apr 2012 23:25:00
Defiant: Prevent the attacking team from touching the flag in a matchmade 1-Flag CTF game.
Unlocked: 30 Apr 2012 01:05:41
Defiant: Assassinate a player that just exited Armor-Lock in a matchmade game.
Unlocked: 26 Apr 2012 23:54:04
Defiant: Kill 3 players with the Oddball in a matchmade Oddball game.
Unlocked: 26 Apr 2012 21:53:21
Defiant: Successfully return two flags in a matchmade CTF game.
Unlocked: 26 Apr 2012 21:51:02
Defiant: Capture two flags from an enemy capture zone in a matchmade Stockpile game.
Unlocked: 26 Apr 2012 21:48:14
All Alone
10Defiant: Be the last surviving uninfected player in a matchmade Infection game.
Unlocked: Offline
Anniversary: Run over 5 people with a vehicle in a matchmade game.
Unlocked: 29 Apr 2012 13:27:53
Anniversary: Stick and kill the flag carrier with a Plasma Grenade in a matchmade game.
Unlocked: 26 Apr 2012 23:24:38
Anniversary: Infect 3 players in a single round in a matchmade Infection game.
Unlocked: 26 Apr 2012 23:13:00
Anniversary: Capture 10 skulls at once in a matchmade Headhunter game.
Unlocked: 26 Apr 2012 22:47:32
Dive Bomber
50Anniversary: Perform a Beat Down on an enemy player while using the Jetpack during a matchmade game.
Unlocked: 26 Apr 2012 22:32:25
Top Shot
50Anniversary: Get 3 headshot kills in a row in a matchmade game.
Unlocked: 26 Apr 2012 22:23:43
Anniversary: Kill an enemy with their own Plasma Grenade that is stuck to you in a matchmade game.
Unlocked: 26 Apr 2012 22:22:51