Score a Triple Kill with the sword in a ranked free for all playlist (Online).
Unlocked: 12 Oct 2007 13:18:09
Advance to the Spartan Officer ranks (Online).
Unlocked: 11 Oct 2007 22:32:13
Score a Double Kill with a single spartan laser shot in a ranked free for all playlist (Online).
Unlocked: 11 Oct 2007 17:38:10
Kill 10 enemies without dying in any ranked free for all playlist (Online).
Unlocked: 11 Oct 2007 17:25:04
Orpheus
10Score over 15,000 points in the Campaign meta-game on the eighth mission.
Unlocked: 11 Oct 2007 16:34:08
Vanguard
10Score over 50,000 points in the Campaign meta-game on the seventh mission.
Unlocked: 10 Oct 2007 22:35:52
Ranger
10Score over 50,000 points in the Campaign meta-game on the sixth mission.
Unlocked: 10 Oct 2007 17:14:58
Overkill
5Kill 4 enemies within 4 seconds of one another in a ranked free for all playlist (Online).
Unlocked: 10 Oct 2007 16:04:26
Exterminator
10Score over 15,000 points in the Campaign meta-game on the fifth mission.
Unlocked: 08 Oct 2007 16:09:38
Askar
10Score over 15,000 points in the Campaign meta-game on the fourth mission.
Unlocked: 07 Oct 2007 14:18:53
Cavalier
10Score over 15,000 points in the Campaign meta-game on the third mission.
Unlocked: 07 Oct 2007 12:40:13
Destroy an enemy vehicle with equipment in a ranked playlist or in campaign.
Unlocked: 07 Oct 2007 12:23:06
Demon
10Score over 15,000 points in the Campaign meta-game on the second mission.
Unlocked: 07 Oct 2007 10:09:26
Guerilla
10Score over 15,000 points in the Campaign meta-game on the first mission.
Unlocked: 07 Oct 2007 09:04:56
Board the same vehicle within 10 seconds after being boarded in any free for all playlist (Online).
Unlocked: 06 Oct 2007 18:33:59
Marathon Man
40Locate and access all Terminals in the Campaign.
Unlocked: 06 Oct 2007 15:33:15
Destroy an enemy banshee with the spartan laser or missile pod in a ranked playlist or in campaign.
Unlocked: 06 Oct 2007 15:14:15
Catch
10Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.
Unlocked: 06 Oct 2007 13:02:17
Tilt
10Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.
Unlocked: 06 Oct 2007 07:47:06
Famine
10Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.
Unlocked: 05 Oct 2007 15:31:02
Fog
10Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.
Unlocked: 04 Oct 2007 19:26:46
Thunderstorm
10Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.
Unlocked: 04 Oct 2007 19:18:11
Tough Luck
10Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.
Unlocked: 04 Oct 2007 18:54:17
Black Eye
10Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.
Unlocked: 04 Oct 2007 18:32:12
Splatter an enemy with the mongoose in a ranked free for all playlist (Online).
Unlocked: 04 Oct 2007 17:11:00
Score 5 grenade sticks in any ranked free for all playlist (Online).
Unlocked: 04 Oct 2007 16:25:15
Finish the Campaign on Heroic (unlocks achievement for Normal, if not earned).
Unlocked: 03 Oct 2007 20:05:17
Finish the Campaign on Legendary (unlocks achievements for Normal and Heroic, if not earned).
Unlocked: 03 Oct 2007 20:05:17
Return
50Finish the final mission of the Campaign on Normal, Heroic, or Legendary.
Unlocked: 03 Oct 2007 20:05:16
Finish the Campaign on Normal.
Unlocked: 03 Oct 2007 20:05:16
Mythic
10Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.
Unlocked: 03 Oct 2007 18:48:51
The Key
40Finish the eighth mission of the Campaign on Normal, Heroic, or Legendary.
Unlocked: 03 Oct 2007 18:46:22
Last Stand
40Finish the seventh mission of the Campaign on Normal, Heroic, or Legendary.
Unlocked: 02 Oct 2007 22:40:44
Refuge
30Finish the sixth mission of the Campaign on Normal, Heroic, or Legendary.
Unlocked: 01 Oct 2007 21:51:46
UNSC Spartan
15Earn your Sergeant rating to be recognized as a true Spartan (Online).
Unlocked: 30 Sep 2007 20:06:04
Kill 5 enemies by melee or assassination in a ranked free for all playlist (Online).
Unlocked: 30 Sep 2007 15:02:58
Kill 3 enemies within 4 seconds of one another in a ranked free for all playlist (Online).
Unlocked: 30 Sep 2007 14:11:30
Cleansing
30Finish the fifth mission of the Campaign on Normal, Heroic, or Legendary.
Unlocked: 30 Sep 2007 09:45:43
Assault
30Finish the fourth mission of the Campaign on Normal, Heroic, or Legendary.
Unlocked: 30 Sep 2007 09:02:36
The Road
20Finish the third mission of the Campaign on Normal, Heroic, or Legendary.
Unlocked: 29 Sep 2007 19:05:04
MVP
5Earn the MVP in any ranked playlist (Online).
Unlocked: 28 Sep 2007 22:06:08
Graduate
10Earn 5 EXP or finish 10 games to complete the requirements for basic training (Online).
Unlocked: 28 Sep 2007 21:06:30
Holdout
20Finish the second mission of the Campaign on Normal, Heroic, or Legendary.
Unlocked: 27 Sep 2007 18:01:42
Landfall
20Finish the first mission of the Campaign on Normal, Heroic, or Legendary.
Unlocked: 26 Sep 2007 17:45:00
Iron
10Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.
Unlocked: 26 Sep 2007 17:13:16
Destroy a vehicle that has three enemies in it in a ranked playlist or in campaign.
Unlocked: 26 Sep 2007 16:42:55
Kill 10 enemies with headshots in a ranked free for all playlist or in campaign.
Unlocked: 25 Sep 2007 22:41:01
Kill 5 enemies with the needler in a ranked free for all playlist or in campaign.
Unlocked: 25 Sep 2007 22:28:48
Reclaimer
10Score over 15,000 points in the Campaign meta-game on the final mission.
Unlocked: Offline
On a Legendary map, get a Splatter Spree during any ranked or social match.
Unlocked: 26 Sep 2009 10:45:35
On a Legendary map, get 3 Oddball melee kills during any ranked or social match.
Unlocked: 26 Sep 2009 10:30:26
On a Legendary map, get 3 assassinations during any ranked or social match.
Unlocked: 25 Sep 2009 20:16:08
Flag Dropped
25On a Legendary map, get 2 flag carrier kills during any ranked or social match.
Unlocked: 25 Sep 2009 19:37:19
Defend This
50On a Legendary map, get a flag melee kill during any ranked or social match.
Unlocked: 25 Sep 2009 19:31:32
On a Legendary map, get two Double Kills during any ranked or social match.
Unlocked: 24 Sep 2009 17:29:20
Road Rage
25On a Legendary map, get 5 Warthog chaingun kills during any ranked or social match.
Unlocked: 22 Sep 2009 21:55:07
On a Mythic map, get a Perfection medal during any ranked or social match.
Unlocked: 26 Sep 2009 10:26:57
On a Mythic map, get an Extermination during any ranked or social match.
Unlocked: 26 Sep 2009 10:15:45
Hammer Time
25On Assembly, get 5 Hammer kills during any ranked or social match.
Unlocked: 25 Sep 2009 21:08:41
On a Mythic map, get a Bulltrue medal during any ranked or social match.
Unlocked: 25 Sep 2009 21:03:27
Killtacular
25On a Mythic map, get a Killtacular during any ranked or social match.
Unlocked: 25 Sep 2009 20:57:13
On a Mythic map, infect 2 humans during any ranked or social match.
Unlocked: 25 Sep 2009 19:23:28
On a Mythic map, kill 2 Zombies during any ranked or social match.
Unlocked: 25 Sep 2009 19:21:10
Post Mortem
25On Orbital, get 2 Death From the Grave medals during any ranked or social match.
Unlocked: 24 Sep 2009 17:19:27
On a Mythic map, get a Killjoy medal during any ranked or social match.
Unlocked: 22 Sep 2009 22:05:36
Tank Dropper
25On any Mythic map, get a kill on another player while in monitor mode.
Unlocked: 22 Sep 2009 21:45:40
On Sandbox, find the hidden skull.
Unlocked: 22 Sep 2009 21:39:27
On Orbital, find the hidden skull.
Unlocked: 22 Sep 2009 21:31:57
On Assembly, find the hidden skull.
Unlocked: 22 Sep 2009 21:23:40
Pull
25On Citadel, get a Shotgun Spree during any ranked or social match.
Unlocked: 26 Sep 2009 08:43:18
Ghost Patrol
25On Longshore, get 3 kills with a Ghost during any ranked or social match.
Unlocked: 26 Sep 2009 08:30:50
On Heretic, get a Sword Spree during any ranked or social match.
Unlocked: 25 Sep 2009 20:54:22
On Longshore, find the hidden skull.
Unlocked: 22 Sep 2009 21:29:11
On Heretic, find the hidden skull.
Unlocked: 22 Sep 2009 21:27:23
On Citadel, find the hidden skull.
Unlocked: 22 Sep 2009 21:25:39
Enter into any ranked or social playlist with 7 EXP on the 7th of the month.
Unlocked: 07 Jul 2020 20:10:01
Find all the hidden skulls on the Mythic maps.
Unlocked: 22 Sep 2009 21:39:28
After 9/25/08, complete Halo on 4-player Legendary LIVE co-op, with Iron, and everyone in Ghosts.
Get to the rank of Lieutenant in any playlist in the new EXP progression system.