Advance to the Spartan Officer ranks (Online).
Unlocked: 17 Aug 2012 21:31:03
Destroy an enemy vehicle with equipment in a ranked playlist or in campaign.
Unlocked: 11 Aug 2012 00:08:08
Overkill
5Kill 4 enemies within 4 seconds of one another in a ranked free for all playlist (Online).
Unlocked: 10 Aug 2012 19:31:49
Board the same vehicle within 10 seconds after being boarded in any free for all playlist (Online).
Unlocked: 09 Aug 2012 20:48:39
Splatter an enemy with the mongoose in a ranked free for all playlist (Online).
Unlocked: 09 Aug 2012 20:47:48
Score a Double Kill with a single spartan laser shot in a ranked free for all playlist (Online).
Unlocked: 09 Aug 2012 20:39:08
Score a Triple Kill with the sword in a ranked free for all playlist (Online).
Unlocked: 09 Aug 2012 20:16:13
Kill 10 enemies with headshots in a ranked free for all playlist or in campaign.
Unlocked: 09 Aug 2012 19:44:45
Kill 10 enemies without dying in any ranked free for all playlist (Online).
Unlocked: 09 Aug 2012 19:37:24
Kill 3 enemies within 4 seconds of one another in a ranked free for all playlist (Online).
Unlocked: 09 Aug 2012 19:33:33
Score 5 grenade sticks in any ranked free for all playlist (Online).
Unlocked: 09 Aug 2012 19:30:23
UNSC Spartan
15Earn your Sergeant rating to be recognized as a true Spartan (Online).
Unlocked: 05 Aug 2012 14:07:08
Reclaimer
10Score over 15,000 points in the Campaign meta-game on the final mission.
Unlocked: 05 Aug 2012 12:46:12
Marathon Man
40Locate and access all Terminals in the Campaign.
Unlocked: 05 Aug 2012 12:21:42
Orpheus
10Score over 15,000 points in the Campaign meta-game on the eighth mission.
Unlocked: 05 Aug 2012 12:19:02
Vanguard
10Score over 50,000 points in the Campaign meta-game on the seventh mission.
Unlocked: 05 Aug 2012 11:55:15
Ranger
10Score over 50,000 points in the Campaign meta-game on the sixth mission.
Unlocked: 03 Aug 2012 17:12:12
Exterminator
10Score over 15,000 points in the Campaign meta-game on the fifth mission.
Unlocked: 03 Aug 2012 16:33:23
Askar
10Score over 15,000 points in the Campaign meta-game on the fourth mission.
Unlocked: 03 Aug 2012 16:21:43
Cavalier
10Score over 15,000 points in the Campaign meta-game on the third mission.
Unlocked: 03 Aug 2012 16:03:57
Demon
10Score over 15,000 points in the Campaign meta-game on the second mission.
Unlocked: 03 Aug 2012 15:44:19
Guerilla
10Score over 15,000 points in the Campaign meta-game on the first mission.
Unlocked: 03 Aug 2012 15:23:05
Destroy a vehicle that has three enemies in it in a ranked playlist or in campaign.
Unlocked: 07 Feb 2012 13:43:46
Kill 5 enemies by melee or assassination in a ranked free for all playlist (Online).
Unlocked: 26 Jun 2010 18:35:18
Finish the Campaign on Heroic (unlocks achievement for Normal, if not earned).
Unlocked: 12 Jun 2010 09:35:25
Finish the Campaign on Legendary (unlocks achievements for Normal and Heroic, if not earned).
Unlocked: 12 Jun 2010 09:35:25
Tilt
10Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.
Unlocked: 11 Jun 2010 20:06:10
Thunderstorm
10Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.
Unlocked: 11 Jun 2010 18:33:12
Catch
10Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.
Unlocked: 11 Jun 2010 16:48:30
Famine
10Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.
Unlocked: 10 Jun 2010 19:56:03
Fog
10Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.
Unlocked: 10 Jun 2010 19:35:34
Iron
10Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.
Unlocked: 10 Jun 2010 19:05:07
Tough Luck
10Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.
Unlocked: 10 Jun 2010 18:39:07
Kill 5 enemies with the needler in a ranked free for all playlist or in campaign.
Unlocked: 10 Jun 2010 17:38:28
Mythic
10Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.
Unlocked: 10 Jun 2010 16:52:54
Black Eye
10Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.
Unlocked: 09 Jun 2010 17:32:20
Destroy an enemy banshee with the spartan laser or missile pod in a ranked playlist or in campaign.
Unlocked: 31 May 2010 14:08:49
Graduate
10Earn 5 EXP or finish 10 games to complete the requirements for basic training (Online).
Unlocked: 29 May 2010 09:27:20
Finish the Campaign on Normal.
Unlocked: 28 May 2010 15:24:45
Return
50Finish the final mission of the Campaign on Normal, Heroic, or Legendary.
Unlocked: 28 May 2010 15:24:44
The Key
40Finish the eighth mission of the Campaign on Normal, Heroic, or Legendary.
Unlocked: 28 May 2010 14:45:54
Last Stand
40Finish the seventh mission of the Campaign on Normal, Heroic, or Legendary.
Unlocked: 27 May 2010 21:59:41
Refuge
30Finish the sixth mission of the Campaign on Normal, Heroic, or Legendary.
Unlocked: 27 May 2010 16:30:41
Cleansing
30Finish the fifth mission of the Campaign on Normal, Heroic, or Legendary.
Unlocked: 27 May 2010 07:55:12
Assault
30Finish the fourth mission of the Campaign on Normal, Heroic, or Legendary.
Unlocked: 27 May 2010 07:34:09
The Road
20Finish the third mission of the Campaign on Normal, Heroic, or Legendary.
Unlocked: 27 May 2010 07:07:22
Holdout
20Finish the second mission of the Campaign on Normal, Heroic, or Legendary.
Unlocked: 26 May 2010 21:53:14
Landfall
20Finish the first mission of the Campaign on Normal, Heroic, or Legendary.
Unlocked: 26 May 2010 21:15:36
MVP
5Earn the MVP in any ranked playlist (Online).
Unlocked: 16 Apr 2010 21:27:59
Flag Dropped
25On a Legendary map, get 2 flag carrier kills during any ranked or social match.
Unlocked: 09 Aug 2012 21:49:39
On a Legendary map, get 3 Oddball melee kills during any ranked or social match.
Unlocked: 26 Jun 2010 20:52:57
Road Rage
25On a Legendary map, get 5 Warthog chaingun kills during any ranked or social match.
Unlocked: 26 Jun 2010 20:29:02
On a Legendary map, get a Splatter Spree during any ranked or social match.
Unlocked: 26 Jun 2010 20:27:42
On a Legendary map, get 3 assassinations during any ranked or social match.
Unlocked: 26 Jun 2010 19:44:09
On a Legendary map, get two Double Kills during any ranked or social match.
Unlocked: 26 Jun 2010 19:44:08
Defend This
50On a Legendary map, get a flag melee kill during any ranked or social match.
Unlocked: 11 Jun 2010 21:33:09
Killtacular
25On a Mythic map, get a Killtacular during any ranked or social match.
Unlocked: 09 Aug 2012 23:29:54
On a Mythic map, get a Bulltrue medal during any ranked or social match.
Unlocked: 09 Aug 2012 22:07:05
On a Mythic map, kill 2 Zombies during any ranked or social match.
Unlocked: 27 Jun 2010 09:51:51
Hammer Time
25On Assembly, get 5 Hammer kills during any ranked or social match.
Unlocked: 26 Jun 2010 20:54:57
Post Mortem
25On Orbital, get 2 Death From the Grave medals during any ranked or social match.
Unlocked: 26 Jun 2010 20:20:47
On a Mythic map, get a Perfection medal during any ranked or social match.
Unlocked: 26 Jun 2010 20:09:45
On a Mythic map, get an Extermination during any ranked or social match.
Unlocked: 26 Jun 2010 20:03:39
On a Mythic map, get a Killjoy medal during any ranked or social match.
Unlocked: 26 Jun 2010 19:46:49
On a Mythic map, infect 2 humans during any ranked or social match.
Unlocked: 26 Jun 2010 18:57:54
Tank Dropper
25On any Mythic map, get a kill on another player while in monitor mode.
Unlocked: 12 Jun 2010 13:50:00
On Assembly, find the hidden skull.
Unlocked: 10 Jun 2010 20:28:12
On Orbital, find the hidden skull.
Unlocked: 10 Jun 2010 20:25:34
On Sandbox, find the hidden skull.
Unlocked: 10 Jun 2010 20:23:32
Ghost Patrol
25On Longshore, get 3 kills with a Ghost during any ranked or social match.
Unlocked: 09 Aug 2012 22:40:56
Pull
25On Citadel, get a Shotgun Spree during any ranked or social match.
Unlocked: 26 Jun 2010 20:02:49
On Heretic, get a Sword Spree during any ranked or social match.
Unlocked: 26 Jun 2010 19:47:09
On Heretic, find the hidden skull.
Unlocked: 12 Jun 2010 13:29:37
On Citadel, find the hidden skull.
Unlocked: 12 Jun 2010 13:28:00
On Longshore, find the hidden skull.
Unlocked: 12 Jun 2010 13:15:52
Get to the rank of Lieutenant in any playlist in the new EXP progression system.
Unlocked: 17 Aug 2012 21:31:04
After 9/25/08, complete Halo on 4-player Legendary LIVE co-op, with Iron, and everyone in Ghosts.
Unlocked: 10 Aug 2012 23:48:47
Enter into any ranked or social playlist with 7 EXP on the 7th of the month.
Unlocked: 07 Feb 2012 14:06:05
Find all the hidden skulls on the Mythic maps.
Unlocked: 12 Jun 2010 13:29:38