Advance to the Spartan Officer ranks (Online).
Unlocked: 10 Jan 2013 01:08:40
UNSC Spartan
15Earn your Sergeant rating to be recognized as a true Spartan (Online).
Unlocked: 09 Jan 2013 00:50:49
Score a Double Kill with a single spartan laser shot in a ranked free for all playlist (Online).
Unlocked: 08 Jan 2013 20:55:09
Overkill
5Kill 4 enemies within 4 seconds of one another in a ranked free for all playlist (Online).
Unlocked: 08 Jan 2013 20:34:53
Vanguard
10Score over 50,000 points in the Campaign meta-game on the seventh mission.
Unlocked: 22 Apr 2012 18:44:43
Orpheus
10Score over 15,000 points in the Campaign meta-game on the eighth mission.
Unlocked: 22 Apr 2012 17:23:53
Ranger
10Score over 50,000 points in the Campaign meta-game on the sixth mission.
Unlocked: 22 Apr 2012 15:26:30
Exterminator
10Score over 15,000 points in the Campaign meta-game on the fifth mission.
Unlocked: 22 Apr 2012 14:42:01
Askar
10Score over 15,000 points in the Campaign meta-game on the fourth mission.
Unlocked: 22 Apr 2012 14:19:57
Cavalier
10Score over 15,000 points in the Campaign meta-game on the third mission.
Unlocked: 22 Apr 2012 13:32:26
Demon
10Score over 15,000 points in the Campaign meta-game on the second mission.
Unlocked: 21 Apr 2012 19:36:20
MVP
5Earn the MVP in any ranked playlist (Online).
Unlocked: 21 Apr 2012 16:26:33
Guerilla
10Score over 15,000 points in the Campaign meta-game on the first mission.
Unlocked: 21 Apr 2012 13:57:39
Destroy an enemy vehicle with equipment in a ranked playlist or in campaign.
Unlocked: 21 Apr 2012 01:44:20
Destroy a vehicle that has three enemies in it in a ranked playlist or in campaign.
Unlocked: 21 Apr 2012 01:31:18
Board the same vehicle within 10 seconds after being boarded in any free for all playlist (Online).
Unlocked: 20 Apr 2012 22:50:52
Graduate
10Earn 5 EXP or finish 10 games to complete the requirements for basic training (Online).
Unlocked: 20 Apr 2012 22:17:36
Score a Triple Kill with the sword in a ranked free for all playlist (Online).
Unlocked: 20 Apr 2012 18:43:19
Kill 5 enemies by melee or assassination in a ranked free for all playlist (Online).
Unlocked: 20 Apr 2012 18:20:09
Kill 3 enemies within 4 seconds of one another in a ranked free for all playlist (Online).
Unlocked: 20 Apr 2012 18:18:29
Score 5 grenade sticks in any ranked free for all playlist (Online).
Unlocked: 20 Apr 2012 17:50:29
Kill 10 enemies without dying in any ranked free for all playlist (Online).
Unlocked: 20 Apr 2012 17:36:06
Splatter an enemy with the mongoose in a ranked free for all playlist (Online).
Unlocked: 20 Apr 2012 17:30:05
Return
50Finish the final mission of the Campaign on Normal, Heroic, or Legendary.
Unlocked: 20 Apr 2012 14:54:08
Finish the Campaign on Normal.
Unlocked: 20 Apr 2012 14:54:08
Finish the Campaign on Heroic (unlocks achievement for Normal, if not earned).
Unlocked: 20 Apr 2012 14:54:08
Finish the Campaign on Legendary (unlocks achievements for Normal and Heroic, if not earned).
Unlocked: 20 Apr 2012 14:54:08
Reclaimer
10Score over 15,000 points in the Campaign meta-game on the final mission.
Unlocked: 20 Apr 2012 14:54:08
Mythic
10Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.
Unlocked: 19 Apr 2012 15:16:07
Marathon Man
40Locate and access all Terminals in the Campaign.
Unlocked: 19 Apr 2012 15:10:36
The Key
40Finish the eighth mission of the Campaign on Normal, Heroic, or Legendary.
Unlocked: 19 Apr 2012 15:05:35
Tilt
10Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.
Unlocked: 19 Apr 2012 14:24:37
Last Stand
40Finish the seventh mission of the Campaign on Normal, Heroic, or Legendary.
Unlocked: 19 Apr 2012 13:50:00
Thunderstorm
10Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.
Unlocked: 19 Apr 2012 12:53:39
Refuge
30Finish the sixth mission of the Campaign on Normal, Heroic, or Legendary.
Unlocked: 19 Apr 2012 01:59:35
Famine
10Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.
Unlocked: 19 Apr 2012 01:09:15
Kill 10 enemies with headshots in a ranked free for all playlist or in campaign.
Unlocked: 19 Apr 2012 00:34:23
Cleansing
30Finish the fifth mission of the Campaign on Normal, Heroic, or Legendary.
Unlocked: 19 Apr 2012 00:10:09
Fog
10Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.
Unlocked: 18 Apr 2012 23:44:39
Assault
30Finish the fourth mission of the Campaign on Normal, Heroic, or Legendary.
Unlocked: 18 Apr 2012 23:42:48
Destroy an enemy banshee with the spartan laser or missile pod in a ranked playlist or in campaign.
Unlocked: 18 Apr 2012 23:20:29
Catch
10Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.
Unlocked: 18 Apr 2012 23:10:02
The Road
20Finish the third mission of the Campaign on Normal, Heroic, or Legendary.
Unlocked: 18 Apr 2012 22:58:00
Tough Luck
10Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.
Unlocked: 18 Apr 2012 22:13:11
Holdout
20Finish the second mission of the Campaign on Normal, Heroic, or Legendary.
Unlocked: 18 Apr 2012 21:48:56
Black Eye
10Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.
Unlocked: 18 Apr 2012 20:28:24
Landfall
20Finish the first mission of the Campaign on Normal, Heroic, or Legendary.
Unlocked: 18 Apr 2012 20:26:36
Iron
10Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.
Unlocked: 18 Apr 2012 20:24:30
Kill 5 enemies with the needler in a ranked free for all playlist or in campaign.
Unlocked: 18 Apr 2012 19:48:02
On a Legendary map, get 3 Oddball melee kills during any ranked or social match.
Unlocked: 21 Apr 2012 14:44:54
Road Rage
25On a Legendary map, get 5 Warthog chaingun kills during any ranked or social match.
Unlocked: 20 Apr 2012 23:31:55
On a Legendary map, get a Splatter Spree during any ranked or social match.
Unlocked: 20 Apr 2012 15:47:05
Flag Dropped
25On a Legendary map, get 2 flag carrier kills during any ranked or social match.
Unlocked: 20 Apr 2012 15:28:27
On a Legendary map, get two Double Kills during any ranked or social match.
Unlocked: 20 Apr 2012 15:24:56
On a Legendary map, get 3 assassinations during any ranked or social match.
Unlocked: 20 Apr 2012 15:24:56
Defend This
50On a Legendary map, get a flag melee kill during any ranked or social match.
Unlocked: 20 Apr 2012 15:24:16
On a Mythic map, kill 2 Zombies during any ranked or social match.
Unlocked: 21 Apr 2012 16:13:36
On a Mythic map, infect 2 humans during any ranked or social match.
Unlocked: 21 Apr 2012 14:26:50
Post Mortem
25On Orbital, get 2 Death From the Grave medals during any ranked or social match.
Unlocked: 20 Apr 2012 22:36:15
Killtacular
25On a Mythic map, get a Killtacular during any ranked or social match.
Unlocked: 20 Apr 2012 22:08:54
On a Mythic map, get a Bulltrue medal during any ranked or social match.
Unlocked: 20 Apr 2012 22:06:39
Hammer Time
25On Assembly, get 5 Hammer kills during any ranked or social match.
Unlocked: 20 Apr 2012 16:43:22
On a Mythic map, get a Perfection medal during any ranked or social match.
Unlocked: 20 Apr 2012 16:25:23
On a Mythic map, get an Extermination during any ranked or social match.
Unlocked: 20 Apr 2012 15:42:50
On Sandbox, find the hidden skull.
Unlocked: 18 Apr 2012 02:11:00
On Orbital, find the hidden skull.
Unlocked: 18 Apr 2012 01:11:43
Tank Dropper
25On any Mythic map, get a kill on another player while in monitor mode.
Unlocked: 18 Apr 2012 01:07:38
On Assembly, find the hidden skull.
Unlocked: 18 Apr 2012 01:06:02
On a Mythic map, get a Killjoy medal during any ranked or social match.
Unlocked: 18 Apr 2012 00:19:29
Pull
25On Citadel, get a Shotgun Spree during any ranked or social match.
Unlocked: 20 Apr 2012 16:15:41
On Heretic, get a Sword Spree during any ranked or social match.
Unlocked: 20 Apr 2012 15:57:58
Ghost Patrol
25On Longshore, get 3 kills with a Ghost during any ranked or social match.
Unlocked: 20 Apr 2012 15:46:55
On Longshore, find the hidden skull.
Unlocked: 18 Apr 2012 02:21:42
On Heretic, find the hidden skull.
Unlocked: 18 Apr 2012 02:17:51
On Citadel, find the hidden skull.
Unlocked: 18 Apr 2012 02:16:31
Enter into any ranked or social playlist with 7 EXP on the 7th of the month.
Unlocked: 07 Feb 2013 18:00:33
After 9/25/08, complete Halo on 4-player Legendary LIVE co-op, with Iron, and everyone in Ghosts.
Unlocked: 10 Jan 2013 03:14:18
Get to the rank of Lieutenant in any playlist in the new EXP progression system.
Unlocked: 10 Jan 2013 01:08:40
Find all the hidden skulls on the Mythic maps.
Unlocked: 18 Apr 2012 02:21:42