- Headshot Honcho
Killed 10 enemies with headshots in a ranked free for all playlist or in campaign.
01 November 2012 - 5 guides
- Mythic
Claimed Mythic skull.
17 April 2010 - 3 guides
- Landfall
Completed the first mission of the Campaign.
- Holdout
Completed the second mission of the Campaign.
- The Road
Completed the third mission of the Campaign.
- Assault
Completed the fourth mission of the Campaign.
- Cleansing
Completed the fifth mission of the Campaign.
- Refuge
Completed the sixth mission of the Campaign.
- Last Stand
Completed the seventh mission of the Campaign.
Unlocked offline - 2 guides
- The Key
Completed the eighth mission of the Campaign.
- Return
Completed the final mission of the Campaign.
- Campaign Complete: Normal
Completed the Campaign on Normal difficulty.
- Tough Luck
Claimed Tough Luck skull.
Unlocked offline - 3 guides
- Fear the Pink Mist
Killed 5 enemies with the needler in a ranked free for all playlist or in campaign.
Unlocked offline - 6 guides
- Black Eye
Claimed Black Eye skull.
17 October 2007 - 3 guides
- Iron
Claimed Iron skull.
17 October 2007 - 3 guides
- Used Car Salesman
Destroyed a vehicle that has three enemies in it in a ranked playlist or in campaign.
14 October 2007 - 7 guides
- Graduate
Graduated from basic training. Stick with it to earn your Spartan Insignia.
13 October 2007 - 4 guides
- Campaign Complete: Heroic
Finish the Campaign on Heroic (unlocks achievement for Normal, if not earned).
Locked - 2 guides
- Campaign Complete: Legendary
Finish the Campaign on Legendary (unlocks achievements for Normal and Heroic, if not earned).
Locked - 17 guides
- Catch
Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.
Locked - 5 guides
- Fog
Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.
Locked - 4 guides
- Famine
Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.
Locked - 5 guides
- Thunderstorm
Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.
Locked - 3 guides
- Tilt
Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.
Locked - 4 guides
- UNSC Spartan
Earn your Sergeant rating to be recognized as a true Spartan (Online).
Locked - 2 guides
- Spartan Officer
Advance to the Spartan Officer ranks (Online).
Locked - 9 guides
- Two for One
Score a Double Kill with a single spartan laser shot in a ranked free for all playlist (Online).
Locked - 18 guides
- Too Close to the Sun
Destroy an enemy banshee with the spartan laser or missile pod in a ranked playlist or in campaign.
Locked - 4 guides
- Triple Kill
Kill 3 enemies within 4 seconds of one another in a ranked free for all playlist (Online).
Locked - 6 guides
- Overkill
Kill 4 enemies within 4 seconds of one another in a ranked free for all playlist (Online).
Locked - 9 guides
- Lee R Wilson Memorial
Score 5 grenade sticks in any ranked free for all playlist (Online).
Locked - 8 guides
- We’re in for some Chop
Destroy an enemy vehicle with equipment in a ranked playlist or in campaign.
Locked - 3 guides
- Killing Frenzy
Kill 10 enemies without dying in any ranked free for all playlist (Online).
Locked - 9 guides
- Steppin' Razor
Score a Triple Kill with the sword in a ranked free for all playlist (Online).
Locked - 7 guides
- Mongoose Mowdown
Splatter an enemy with the mongoose in a ranked free for all playlist (Online).
Locked - 9 guides
- Up Close and Personal
Kill 5 enemies by melee or assassination in a ranked free for all playlist (Online).
Locked - 2 guides
- Marathon Man
Locate and access all Terminals in the Campaign.
Locked - 9 guides
- MVP
Earn the MVP in any ranked playlist (Online).
Locked - 3 guides
- Maybe Next Time Buddy
Board the same vehicle within 10 seconds after being boarded in any free for all playlist (Online).
Locked - 7 guides
- Guerilla
Score over 15,000 points in the Campaign meta-game on the first mission.
Locked - 5 guides
- Demon
Score over 15,000 points in the Campaign meta-game on the second mission.
Locked - 4 guides
- Cavalier
Score over 15,000 points in the Campaign meta-game on the third mission.
Locked - 4 guides
- Askar
Score over 15,000 points in the Campaign meta-game on the fourth mission.
Locked - 4 guides
- Exterminator
Score over 15,000 points in the Campaign meta-game on the fifth mission.
Locked - 3 guides
- Ranger
Score over 50,000 points in the Campaign meta-game on the sixth mission.
Locked - 6 guides
- Vanguard
Score over 50,000 points in the Campaign meta-game on the seventh mission.
Locked - 6 guides
- Orpheus
Score over 15,000 points in the Campaign meta-game on the eighth mission.
Locked - 4 guides
- Reclaimer
Score over 15,000 points in the Campaign meta-game on the final mission.
Locked - 4 guides
- Hammer Time
On Assembly, get 5 Hammer kills during any ranked or social match.
Locked - 4 guides
- Post Mortem
On Orbital, get 2 Death From the Grave medals during any ranked or social match.
Locked - 10 guides
- … Get the Horns
On a Mythic map, get a Bulltrue medal during any ranked or social match.
Locked - 13 guides
- Awww, Too Bad
On a Mythic map, get a Killjoy medal during any ranked or social match.
Locked - 2 guides
- Killtacular
On a Mythic map, get a Killtacular during any ranked or social match.
Locked - 11 guides
- Have Fun Respawning
On a Mythic map, get an Extermination during any ranked or social match.
Locked - 6 guides
- Save This Film
On a Mythic map, get a Perfection medal during any ranked or social match.
Locked - 9 guides
- Delicious Brains
On a Mythic map, infect 2 humans during any ranked or social match.
Locked - 3 guides
- Zombie Repeller
On a Mythic map, kill 2 Zombies during any ranked or social match.
Locked - 3 guides
- Tank Dropper
On any Mythic map, get a kill on another player while in monitor mode.
Locked - 14 guides
- Assembly Skull
On Assembly, find the hidden skull.
Locked - 4 guides
- Orbital Skull
On Orbital, find the hidden skull.
Locked - 5 guides
- Sandbox Skull
On Sandbox, find the hidden skull.
Locked - 10 guides