Advance to the Spartan Officer ranks (Online).
Unlocked: 19 Nov 2010 10:13:44
MVP
5Earn the MVP in any ranked playlist (Online).
Unlocked: 16 Nov 2010 00:44:47
Splatter an enemy with the mongoose in a ranked free for all playlist (Online).
Unlocked: 12 Nov 2010 11:05:36
Board the same vehicle within 10 seconds after being boarded in any free for all playlist (Online).
Unlocked: 11 Nov 2010 20:59:51
Score a Double Kill with a single spartan laser shot in a ranked free for all playlist (Online).
Unlocked: 11 Nov 2010 20:04:22
UNSC Spartan
15Earn your Sergeant rating to be recognized as a true Spartan (Online).
Unlocked: 11 Nov 2010 19:56:38
Kill 10 enemies without dying in any ranked free for all playlist (Online).
Unlocked: 11 Nov 2010 19:49:30
Score 5 grenade sticks in any ranked free for all playlist (Online).
Unlocked: 11 Nov 2010 19:43:25
Score a Triple Kill with the sword in a ranked free for all playlist (Online).
Unlocked: 11 Nov 2010 19:41:29
Overkill
5Kill 4 enemies within 4 seconds of one another in a ranked free for all playlist (Online).
Unlocked: 11 Nov 2010 19:33:20
Kill 3 enemies within 4 seconds of one another in a ranked free for all playlist (Online).
Unlocked: 11 Nov 2010 19:33:18
Vanguard
10Score over 50,000 points in the Campaign meta-game on the seventh mission.
Unlocked: 22 Oct 2010 10:27:31
Reclaimer
10Score over 15,000 points in the Campaign meta-game on the final mission.
Unlocked: 26 Sep 2010 09:00:36
Orpheus
10Score over 15,000 points in the Campaign meta-game on the eighth mission.
Unlocked: 26 Sep 2010 08:26:33
Exterminator
10Score over 15,000 points in the Campaign meta-game on the fifth mission.
Unlocked: 17 Sep 2010 10:39:12
Askar
10Score over 15,000 points in the Campaign meta-game on the fourth mission.
Unlocked: 08 Jul 2010 07:25:51
Cavalier
10Score over 15,000 points in the Campaign meta-game on the third mission.
Unlocked: 07 Jul 2010 07:09:48
Demon
10Score over 15,000 points in the Campaign meta-game on the second mission.
Unlocked: 07 Jul 2010 05:52:05
Kill 5 enemies by melee or assassination in a ranked free for all playlist (Online).
Unlocked: 07 Jul 2010 05:19:16
Guerilla
10Score over 15,000 points in the Campaign meta-game on the first mission.
Unlocked: 30 Jun 2010 06:53:36
Destroy an enemy vehicle with equipment in a ranked playlist or in campaign.
Unlocked: 25 May 2010 11:13:57
Kill 10 enemies with headshots in a ranked free for all playlist or in campaign.
Unlocked: 25 May 2010 10:43:15
Finish the Campaign on Legendary (unlocks achievements for Normal and Heroic, if not earned).
Unlocked: 23 May 2010 02:05:52
Fog
10Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.
Unlocked: 22 May 2010 23:48:12
Catch
10Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.
Unlocked: 22 May 2010 22:23:52
Tough Luck
10Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.
Unlocked: 20 Apr 2010 08:24:49
Marathon Man
40Locate and access all Terminals in the Campaign.
Unlocked: 18 Nov 2009 10:33:08
Destroy an enemy banshee with the spartan laser or missile pod in a ranked playlist or in campaign.
Unlocked: 18 Nov 2009 10:14:11
Black Eye
10Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.
Unlocked: 18 Nov 2009 07:06:28
Iron
10Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.
Unlocked: 17 Nov 2009 11:05:52
Mythic
10Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.
Unlocked: 16 Nov 2009 00:43:26
Tilt
10Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.
Unlocked: 16 Nov 2009 00:04:08
Thunderstorm
10Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.
Unlocked: 15 Nov 2009 23:00:28
Graduate
10Earn 5 EXP or finish 10 games to complete the requirements for basic training (Online).
Unlocked: 14 Nov 2009 04:53:37
Famine
10Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.
Unlocked: 09 Nov 2009 08:09:47
Finish the Campaign on Heroic (unlocks achievement for Normal, if not earned).
Unlocked: 08 Nov 2009 07:53:55
Return
50Finish the final mission of the Campaign on Normal, Heroic, or Legendary.
Unlocked: 08 Nov 2009 07:53:54
Finish the Campaign on Normal.
Unlocked: 08 Nov 2009 07:53:54
The Key
40Finish the eighth mission of the Campaign on Normal, Heroic, or Legendary.
Unlocked: 08 Nov 2009 06:44:16
Last Stand
40Finish the seventh mission of the Campaign on Normal, Heroic, or Legendary.
Unlocked: 08 Nov 2009 05:49:51
Refuge
30Finish the sixth mission of the Campaign on Normal, Heroic, or Legendary.
Unlocked: 07 Nov 2009 09:56:40
Cleansing
30Finish the fifth mission of the Campaign on Normal, Heroic, or Legendary.
Unlocked: 07 Nov 2009 07:49:27
Assault
30Finish the fourth mission of the Campaign on Normal, Heroic, or Legendary.
Unlocked: 07 Nov 2009 07:17:12
Kill 5 enemies with the needler in a ranked free for all playlist or in campaign.
Unlocked: 07 Nov 2009 07:10:13
The Road
20Finish the third mission of the Campaign on Normal, Heroic, or Legendary.
Unlocked: 07 Nov 2009 06:24:10
Destroy a vehicle that has three enemies in it in a ranked playlist or in campaign.
Unlocked: 07 Nov 2009 05:48:25
Holdout
20Finish the second mission of the Campaign on Normal, Heroic, or Legendary.
Unlocked: 07 Nov 2009 05:43:03
Landfall
20Finish the first mission of the Campaign on Normal, Heroic, or Legendary.
Unlocked: 07 Nov 2009 05:04:56
Ranger
10Score over 50,000 points in the Campaign meta-game on the sixth mission.
Unlocked: Offline
Flag Dropped
25On a Legendary map, get 2 flag carrier kills during any ranked or social match.
Unlocked: 05 Nov 2010 06:46:58
Defend This
50On a Legendary map, get a flag melee kill during any ranked or social match.
Unlocked: 05 Nov 2010 06:45:38
On a Legendary map, get a Splatter Spree during any ranked or social match.
Unlocked: 05 Nov 2010 05:13:00
Road Rage
25On a Legendary map, get 5 Warthog chaingun kills during any ranked or social match.
Unlocked: 05 Nov 2010 05:10:50
On a Legendary map, get two Double Kills during any ranked or social match.
Unlocked: 05 Nov 2010 04:37:56
On a Legendary map, get 3 assassinations during any ranked or social match.
Unlocked: 05 Nov 2010 04:35:18
On a Legendary map, get 3 Oddball melee kills during any ranked or social match.
Unlocked: 05 Nov 2010 04:35:16
On a Mythic map, infect 2 humans during any ranked or social match.
Unlocked: 17 Nov 2010 10:08:12
On a Mythic map, kill 2 Zombies during any ranked or social match.
Unlocked: 17 Nov 2010 09:59:10
On a Mythic map, get a Bulltrue medal during any ranked or social match.
Unlocked: 11 Nov 2010 21:12:05
Tank Dropper
25On any Mythic map, get a kill on another player while in monitor mode.
Unlocked: 06 Nov 2010 02:05:27
Killtacular
25On a Mythic map, get a Killtacular during any ranked or social match.
Unlocked: 05 Nov 2010 08:56:20
Hammer Time
25On Assembly, get 5 Hammer kills during any ranked or social match.
Unlocked: 05 Nov 2010 08:10:46
On a Mythic map, get a Perfection medal during any ranked or social match.
Unlocked: 05 Nov 2010 07:56:00
On a Mythic map, get an Extermination during any ranked or social match.
Unlocked: 05 Nov 2010 07:05:32
Post Mortem
25On Orbital, get 2 Death From the Grave medals during any ranked or social match.
Unlocked: 05 Nov 2010 06:42:46
On a Mythic map, get a Killjoy medal during any ranked or social match.
Unlocked: 05 Nov 2010 06:11:24
On Sandbox, find the hidden skull.
Unlocked: 26 May 2010 09:25:20
On Orbital, find the hidden skull.
Unlocked: 26 May 2010 08:54:33
On Assembly, find the hidden skull.
Unlocked: 26 May 2010 08:52:15
Ghost Patrol
25On Longshore, get 3 kills with a Ghost during any ranked or social match.
Unlocked: 05 Nov 2010 07:05:29
On Heretic, get a Sword Spree during any ranked or social match.
Unlocked: 05 Nov 2010 06:24:48
Pull
25On Citadel, get a Shotgun Spree during any ranked or social match.
Unlocked: 05 Nov 2010 06:12:04
On Longshore, find the hidden skull.
Unlocked: 26 May 2010 09:36:36
On Heretic, find the hidden skull.
Unlocked: 26 May 2010 09:32:56
On Citadel, find the hidden skull.
Unlocked: 26 May 2010 09:30:18
Get to the rank of Lieutenant in any playlist in the new EXP progression system.
Unlocked: 19 Nov 2010 10:13:45
After 9/25/08, complete Halo on 4-player Legendary LIVE co-op, with Iron, and everyone in Ghosts.
Unlocked: 11 Nov 2010 22:33:40
Enter into any ranked or social playlist with 7 EXP on the 7th of the month.
Unlocked: 07 Jul 2010 18:44:19
Find all the hidden skulls on the Mythic maps.
Unlocked: 26 May 2010 09:36:39