Reclaimer
10Score over 15,000 points in the Campaign meta-game on the final mission.
Unlocked: 29 Dec 2010 17:04:58
Orpheus
10Score over 15,000 points in the Campaign meta-game on the eighth mission.
Unlocked: 29 Dec 2010 16:38:46
Vanguard
10Score over 50,000 points in the Campaign meta-game on the seventh mission.
Unlocked: 29 Dec 2010 11:35:04
Ranger
10Score over 50,000 points in the Campaign meta-game on the sixth mission.
Unlocked: 28 Dec 2010 21:25:38
Exterminator
10Score over 15,000 points in the Campaign meta-game on the fifth mission.
Unlocked: 28 Dec 2010 20:55:02
Askar
10Score over 15,000 points in the Campaign meta-game on the fourth mission.
Unlocked: 25 Aug 2010 16:27:35
Cavalier
10Score over 15,000 points in the Campaign meta-game on the third mission.
Unlocked: 25 Aug 2010 16:03:08
Demon
10Score over 15,000 points in the Campaign meta-game on the second mission.
Unlocked: 21 Aug 2010 15:03:15
Guerilla
10Score over 15,000 points in the Campaign meta-game on the first mission.
Unlocked: 21 Aug 2010 14:35:11
Marathon Man
40Locate and access all Terminals in the Campaign.
Unlocked: 16 Aug 2010 20:00:05
Thunderstorm
10Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.
Unlocked: 15 Aug 2010 20:18:16
Finish the Campaign on Normal.
Unlocked: 30 Jun 2010 16:43:53
Finish the Campaign on Heroic (unlocks achievement for Normal, if not earned).
Unlocked: 30 Jun 2010 16:43:53
Finish the Campaign on Legendary (unlocks achievements for Normal and Heroic, if not earned).
Unlocked: 30 Jun 2010 16:43:53
Return
50Finish the final mission of the Campaign on Normal, Heroic, or Legendary.
Unlocked: 30 Jun 2010 16:43:52
Mythic
10Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.
Unlocked: 30 Jun 2010 16:17:42
The Key
40Finish the eighth mission of the Campaign on Normal, Heroic, or Legendary.
Unlocked: 30 Jun 2010 16:17:05
Tilt
10Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.
Unlocked: 30 Jun 2010 16:05:06
Last Stand
40Finish the seventh mission of the Campaign on Normal, Heroic, or Legendary.
Unlocked: 30 Jun 2010 16:00:54
Destroy an enemy vehicle with equipment in a ranked playlist or in campaign.
Unlocked: 28 Jun 2010 22:47:59
Destroy an enemy banshee with the spartan laser or missile pod in a ranked playlist or in campaign.
Unlocked: 28 Jun 2010 22:38:55
MVP
5Earn the MVP in any ranked playlist (Online).
Unlocked: 28 Jun 2010 22:13:30
Splatter an enemy with the mongoose in a ranked free for all playlist (Online).
Unlocked: 28 Jun 2010 20:15:48
Refuge
30Finish the sixth mission of the Campaign on Normal, Heroic, or Legendary.
Unlocked: 28 Jun 2010 16:00:57
Famine
10Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.
Unlocked: 28 Jun 2010 15:42:52
Kill 10 enemies with headshots in a ranked free for all playlist or in campaign.
Unlocked: 28 Jun 2010 15:39:30
Cleansing
30Finish the fifth mission of the Campaign on Normal, Heroic, or Legendary.
Unlocked: 28 Jun 2010 15:33:45
Fog
10Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.
Unlocked: 28 Jun 2010 15:28:23
Assault
30Finish the fourth mission of the Campaign on Normal, Heroic, or Legendary.
Unlocked: 28 Jun 2010 15:27:41
Catch
10Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.
Unlocked: 28 Jun 2010 15:14:41
The Road
20Finish the third mission of the Campaign on Normal, Heroic, or Legendary.
Unlocked: 28 Jun 2010 15:11:29
Tough Luck
10Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.
Unlocked: 28 Jun 2010 15:04:50
Holdout
20Finish the second mission of the Campaign on Normal, Heroic, or Legendary.
Unlocked: 28 Jun 2010 14:56:57
Destroy a vehicle that has three enemies in it in a ranked playlist or in campaign.
Unlocked: 28 Jun 2010 14:42:07
Black Eye
10Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.
Unlocked: 28 Jun 2010 14:39:23
Landfall
20Finish the first mission of the Campaign on Normal, Heroic, or Legendary.
Unlocked: 28 Jun 2010 14:39:07
Iron
10Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.
Unlocked: 28 Jun 2010 14:36:40
Kill 5 enemies with the needler in a ranked free for all playlist or in campaign.
Unlocked: 28 Jun 2010 14:32:00
Advance to the Spartan Officer ranks (Online).
Unlocked: 27 Jun 2010 01:44:36
UNSC Spartan
15Earn your Sergeant rating to be recognized as a true Spartan (Online).
Unlocked: 26 Jun 2010 22:12:54
Graduate
10Earn 5 EXP or finish 10 games to complete the requirements for basic training (Online).
Unlocked: 26 Jun 2010 21:43:38
Score a Double Kill with a single spartan laser shot in a ranked free for all playlist (Online).
Unlocked: 22 Jun 2010 20:11:48
Board the same vehicle within 10 seconds after being boarded in any free for all playlist (Online).
Unlocked: 22 Jun 2010 20:08:28
Score 5 grenade sticks in any ranked free for all playlist (Online).
Unlocked: 22 Jun 2010 20:00:37
Score a Triple Kill with the sword in a ranked free for all playlist (Online).
Unlocked: 22 Jun 2010 19:55:36
Kill 10 enemies without dying in any ranked free for all playlist (Online).
Unlocked: 22 Jun 2010 19:46:48
Kill 5 enemies by melee or assassination in a ranked free for all playlist (Online).
Unlocked: 22 Jun 2010 19:44:28
Kill 3 enemies within 4 seconds of one another in a ranked free for all playlist (Online).
Unlocked: 22 Jun 2010 19:43:38
Overkill
5Kill 4 enemies within 4 seconds of one another in a ranked free for all playlist (Online).
Unlocked: 22 Jun 2010 19:43:38
On a Legendary map, get 3 Oddball melee kills during any ranked or social match.
Unlocked: 14 Aug 2010 01:47:00
On a Legendary map, get a Splatter Spree during any ranked or social match.
Unlocked: 13 Jul 2010 19:53:57
Road Rage
25On a Legendary map, get 5 Warthog chaingun kills during any ranked or social match.
Unlocked: 13 Jul 2010 19:47:57
On a Legendary map, get 3 assassinations during any ranked or social match.
Unlocked: 13 Jul 2010 19:09:31
Defend This
50On a Legendary map, get a flag melee kill during any ranked or social match.
Unlocked: 13 Jul 2010 19:07:51
Flag Dropped
25On a Legendary map, get 2 flag carrier kills during any ranked or social match.
Unlocked: 13 Jul 2010 19:07:31
On a Legendary map, get two Double Kills during any ranked or social match.
Unlocked: 26 Jun 2010 22:09:49
Post Mortem
25On Orbital, get 2 Death From the Grave medals during any ranked or social match.
Unlocked: 15 Jul 2010 17:59:45
Tank Dropper
25On any Mythic map, get a kill on another player while in monitor mode.
Unlocked: 13 Jul 2010 23:49:25
Killtacular
25On a Mythic map, get a Killtacular during any ranked or social match.
Unlocked: 13 Jul 2010 20:41:13
On a Mythic map, get a Perfection medal during any ranked or social match.
Unlocked: 13 Jul 2010 19:44:09
Hammer Time
25On Assembly, get 5 Hammer kills during any ranked or social match.
Unlocked: 13 Jul 2010 19:30:23
On a Mythic map, get an Extermination during any ranked or social match.
Unlocked: 13 Jul 2010 19:11:21
On Sandbox, find the hidden skull.
Unlocked: 30 Jun 2010 17:25:38
On Orbital, find the hidden skull.
Unlocked: 30 Jun 2010 17:09:51
On Assembly, find the hidden skull.
Unlocked: 30 Jun 2010 17:07:07
On a Mythic map, get a Bulltrue medal during any ranked or social match.
Unlocked: 26 Jun 2010 22:54:32
On a Mythic map, get a Killjoy medal during any ranked or social match.
Unlocked: 26 Jun 2010 22:05:49
On a Mythic map, infect 2 humans during any ranked or social match.
Unlocked: 26 Jun 2010 22:05:28
On a Mythic map, kill 2 Zombies during any ranked or social match.
Unlocked: 26 Jun 2010 21:57:45
Ghost Patrol
25On Longshore, get 3 kills with a Ghost during any ranked or social match.
Unlocked: 16 Jul 2010 13:59:52
On Heretic, get a Sword Spree during any ranked or social match.
Unlocked: 13 Jul 2010 20:53:33
Pull
25On Citadel, get a Shotgun Spree during any ranked or social match.
Unlocked: 13 Jul 2010 19:13:52
On Citadel, find the hidden skull.
Unlocked: 30 Jun 2010 17:41:40
On Heretic, find the hidden skull.
Unlocked: 30 Jun 2010 17:35:44
On Longshore, find the hidden skull.
Unlocked: 30 Jun 2010 17:32:44
After 9/25/08, complete Halo on 4-player Legendary LIVE co-op, with Iron, and everyone in Ghosts.
Unlocked: 11 Jul 2010 23:03:27
Enter into any ranked or social playlist with 7 EXP on the 7th of the month.
Unlocked: 06 Jul 2010 23:39:14
Find all the hidden skulls on the Mythic maps.
Unlocked: 30 Jun 2010 17:41:40
Get to the rank of Lieutenant in any playlist in the new EXP progression system.
Unlocked: 27 Jun 2010 01:44:36