Score over 15,000 points in the Campaign meta-game on the eighth mission.

Unlocked: 10 Jun 2010 17:06:28

Score over 15,000 points in the Campaign meta-game on the final mission.

Unlocked: 28 Jun 2008 22:52:12

Score over 15,000 points in the Campaign meta-game on the fifth mission.

Unlocked: 25 Jun 2008 22:33:31

Score over 15,000 points in the Campaign meta-game on the fourth mission.

Unlocked: 25 Jun 2008 02:34:38

Score over 15,000 points in the Campaign meta-game on the third mission.

Unlocked: 24 Jun 2008 21:54:26

Score over 15,000 points in the Campaign meta-game on the second mission.

Unlocked: 24 Jun 2008 18:03:32

Splatter an enemy with the mongoose in a ranked free for all playlist (Online).

Unlocked: 24 Jun 2008 06:09:58

Locate and access all Terminals in the Campaign.

Unlocked: 24 Jun 2008 03:54:45

Finish the Campaign on Legendary (unlocks achievements for Normal and Heroic, if not earned).

Unlocked: 24 Jun 2008 03:52:16

Finish the Campaign on Heroic (unlocks achievement for Normal, if not earned).

Unlocked: 24 Jun 2008 03:52:15

Board the same vehicle within 10 seconds after being boarded in any free for all playlist (Online).

Unlocked: 22 Jun 2008 07:06:17

Score a Double Kill with a single spartan laser shot in a ranked free for all playlist (Online).

Unlocked: 22 Jun 2008 06:15:18

Destroy an enemy vehicle with equipment in a ranked playlist or in campaign.

Unlocked: 22 Jun 2008 01:32:58

Score a Triple Kill with the sword in a ranked free for all playlist (Online).

Unlocked: 15 Nov 2007 02:50:14

Destroy a vehicle that has three enemies in it in a ranked playlist or in campaign.

Unlocked: 13 Oct 2007 21:32:01

Kill 10 enemies with headshots in a ranked free for all playlist or in campaign.

Unlocked: 11 Oct 2007 02:13:40

Kill 4 enemies within 4 seconds of one another in a ranked free for all playlist (Online).

Unlocked: 11 Oct 2007 01:52:48

Kill 3 enemies within 4 seconds of one another in a ranked free for all playlist (Online).

Unlocked: 11 Oct 2007 01:44:28

Score 5 grenade sticks in any ranked free for all playlist (Online).

Unlocked: 11 Oct 2007 01:15:59

Destroy an enemy banshee with the spartan laser or missile pod in a ranked playlist or in campaign.

Unlocked: 10 Oct 2007 22:59:29

Advance to the Spartan Officer ranks (Online).

Unlocked: 08 Oct 2007 03:32:23

Score over 15,000 points in the Campaign meta-game on the first mission.

Unlocked: 04 Oct 2007 02:03:42

Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.

Unlocked: 02 Oct 2007 22:39:57

Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.

Unlocked: 02 Oct 2007 20:58:26

Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.

Unlocked: 02 Oct 2007 19:33:58

Kill 10 enemies without dying in any ranked free for all playlist (Online).

Unlocked: 01 Oct 2007 19:59:43

Kill 5 enemies by melee or assassination in a ranked free for all playlist (Online).

Unlocked: 01 Oct 2007 19:49:11

Earn your Sergeant rating to be recognized as a true Spartan (Online).

Unlocked: 01 Oct 2007 19:18:25

Earn the MVP in any ranked playlist (Online).

Unlocked: 01 Oct 2007 02:53:59

Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.

Unlocked: 28 Sep 2007 20:36:01

Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.

Unlocked: 28 Sep 2007 19:47:31

Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.

Unlocked: 28 Sep 2007 19:40:36

Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.

Unlocked: 28 Sep 2007 19:33:39

Finish the final mission of the Campaign on Normal, Heroic, or Legendary.

Unlocked: 28 Sep 2007 04:06:54

Finish the Campaign on Normal.

Unlocked: 28 Sep 2007 04:06:54

Finish the eighth mission of the Campaign on Normal, Heroic, or Legendary.

Unlocked: 28 Sep 2007 02:42:25

Earn 5 EXP or finish 10 games to complete the requirements for basic training (Online).

Unlocked: 26 Sep 2007 22:20:56

Finish the seventh mission of the Campaign on Normal, Heroic, or Legendary.

Unlocked: 26 Sep 2007 21:04:48

Finish the sixth mission of the Campaign on Normal, Heroic, or Legendary.

Unlocked: 26 Sep 2007 04:19:21

Finish the fifth mission of the Campaign on Normal, Heroic, or Legendary.

Unlocked: 26 Sep 2007 03:24:05

Finish the fourth mission of the Campaign on Normal, Heroic, or Legendary.

Unlocked: 26 Sep 2007 03:03:43

Finish the third mission of the Campaign on Normal, Heroic, or Legendary.

Unlocked: 26 Sep 2007 02:36:27

Finish the second mission of the Campaign on Normal, Heroic, or Legendary.

Unlocked: 26 Sep 2007 02:20:08

Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.

Unlocked: 26 Sep 2007 02:16:53

Finish the first mission of the Campaign on Normal, Heroic, or Legendary.

Unlocked: 26 Sep 2007 01:54:49

Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.

Unlocked: 26 Sep 2007 01:48:38

Kill 5 enemies with the needler in a ranked free for all playlist or in campaign.

Unlocked: 26 Sep 2007 01:44:00

Score over 50,000 points in the Campaign meta-game on the sixth mission.

Score over 50,000 points in the Campaign meta-game on the seventh mission.

On a Legendary map, get a flag melee kill during any ranked or social match.

Unlocked: 11 Sep 2010 18:37:22

On a Legendary map, get 2 flag carrier kills during any ranked or social match.

Unlocked: 22 Aug 2010 06:18:30

On a Legendary map, get a Splatter Spree during any ranked or social match.

Unlocked: 04 Jun 2010 17:27:54

On a Legendary map, get 5 Warthog chaingun kills during any ranked or social match.

Unlocked: 02 Jun 2010 18:53:02

On a Legendary map, get 3 Oddball melee kills during any ranked or social match.

Unlocked: 06 Mar 2009 23:13:08

On a Legendary map, get 3 assassinations during any ranked or social match.

Unlocked: 07 Oct 2008 01:27:45

On a Legendary map, get two Double Kills during any ranked or social match.

Unlocked: 06 Oct 2008 23:49:59

On a Mythic map, get a Killtacular during any ranked or social match.

Unlocked: 04 Dec 2009 23:47:17

On a Mythic map, get an Extermination during any ranked or social match.

Unlocked: 08 Oct 2009 18:48:02

On a Mythic map, kill 2 Zombies during any ranked or social match.

Unlocked: 21 Jun 2009 09:52:59

On a Mythic map, get a Bulltrue medal during any ranked or social match.

Unlocked: 21 Jun 2009 09:52:58

On a Mythic map, infect 2 humans during any ranked or social match.

Unlocked: 21 Jun 2009 09:50:39

On a Mythic map, get a Killjoy medal during any ranked or social match.

Unlocked: 17 Jun 2009 23:38:49

On Assembly, find the hidden skull.

Unlocked: 11 Apr 2009 03:39:30

On Orbital, find the hidden skull.

Unlocked: 11 Apr 2009 03:36:32

On Sandbox, find the hidden skull.

Unlocked: 11 Apr 2009 03:13:32

On any Mythic map, get a kill on another player while in monitor mode.

Unlocked: 11 Apr 2009 00:38:07

On Assembly, get 5 Hammer kills during any ranked or social match.

On Orbital, get 2 Death From the Grave medals during any ranked or social match.

On a Mythic map, get a Perfection medal during any ranked or social match.

On Citadel, get a Shotgun Spree during any ranked or social match.

Unlocked: 22 Aug 2010 06:20:20

On Longshore, get 3 kills with a Ghost during any ranked or social match.

Unlocked: 21 Aug 2010 02:44:52

On Heretic, get a Sword Spree during any ranked or social match.

Unlocked: 04 Jun 2010 20:52:10

On Longshore, find the hidden skull.

Unlocked: 05 Oct 2009 20:47:53

On Heretic, find the hidden skull.

Unlocked: 05 Oct 2009 20:46:26

On Citadel, find the hidden skull.

Unlocked: 05 Oct 2009 20:45:14

After 9/25/08, complete Halo on 4-player Legendary LIVE co-op, with Iron, and everyone in Ghosts.

Unlocked: 15 Mar 2010 21:21:15

Find all the hidden skulls on the Mythic maps.

Unlocked: 05 Oct 2009 20:47:53

Get to the rank of Lieutenant in any playlist in the new EXP progression system.

Unlocked: 21 Feb 2009 20:57:13

Enter into any ranked or social playlist with 7 EXP on the 7th of the month.

Unlocked: 08 Feb 2009 04:37:19