| | Title | Gamerscore |
 | 
Alas, Poor Yorick
On a Legendary map, get 3 Oddball melee kills during any ranked or social match. | 25  |
|
Askar
Score over 15,000 points in the Campaign meta-game on the fourth mission. | 10 |
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Assault
Finish the fourth mission of the Campaign on Normal, Heroic, or Legendary. | 30 |
|
Assembly Skull
On Assembly, find the hidden skull. | 25 |
|
Awww, Too Bad
On a Mythic map, get a Killjoy medal during any ranked or social match. | 25 |
|
… Get the Horns
On a Mythic map, get a Bulltrue medal during any ranked or social match. | 25 |
|
Black Eye
Find and claim this skull when playing on Normal, Heroic or Legendary difficulty. | 10 |
|
Blades of Fury
On Heretic, get a Sword Spree during any ranked or social match. | 25 |
|
Came… From… Behind
On a Legendary map, get 3 assassinations during any ranked or social match. | 50 |
|
Campaign Complete: Heroic
Finish the Campaign on Heroic (unlocks achievement for Normal, if not earned). | 125 |
|
Campaign Complete: Legendary
Finish the Campaign on Legendary (unlocks achievements for Normal and Heroic, if not earned). | 125 |
|
Campaign Complete: Normal
Finish the Campaign on Normal. | 125 |
|
Catch
Find and claim this skull when playing on Normal, Heroic or Legendary difficulty. | 10 |
|
Cavalier
Score over 15,000 points in the Campaign meta-game on the third mission. | 10 |
|
Citadel Skull
On Citadel, find the hidden skull. | 25 |
|
Cleansing
Finish the fifth mission of the Campaign on Normal, Heroic, or Legendary. | 30 |
|
Defend This
On a Legendary map, get a flag melee kill during any ranked or social match. | 50 |
|
Delicious Brains
On a Mythic map, infect 2 humans during any ranked or social match. | 25 |
|
Demon
Score over 15,000 points in the Campaign meta-game on the second mission. | 10 |
|
Double Double
On a Legendary map, get two Double Kills during any ranked or social match. | 25 |
|
Exterminator
Score over 15,000 points in the Campaign meta-game on the fifth mission. | 10 |
|
Famine
Find and claim this skull when playing on Normal, Heroic or Legendary difficulty. | 10 |
|
Fear the Pink Mist
Kill 5 enemies with the needler in a ranked free for all playlist or in campaign. | 5 |
|
Flag Dropped
On a Legendary map, get 2 flag carrier kills during any ranked or social match. | 25 |
|
Fog
Find and claim this skull when playing on Normal, Heroic or Legendary difficulty. | 10 |
|
Ghost Patrol
On Longshore, get 3 kills with a Ghost during any ranked or social match. | 25 |
|
Graduate
Earn 5 EXP or finish 10 games to complete the requirements for basic training (Online). | 10 |
|
Guerilla
Score over 15,000 points in the Campaign meta-game on the first mission. | 10 |
|
Hammer Time
On Assembly, get 5 Hammer kills during any ranked or social match. | 25 |
|
Have Fun Respawning
On a Mythic map, get an Extermination during any ranked or social match. | 25 |
|
Headshot Honcho
Kill 10 enemies with headshots in a ranked free for all playlist or in campaign. | 5 |
|
Heretic Skull
On Heretic, find the hidden skull. | 25 |
|
Holdout
Finish the second mission of the Campaign on Normal, Heroic, or Legendary. | 20 |
|
Iron
Find and claim this skull when playing on Normal, Heroic or Legendary difficulty. | 10 |
|
Killing Frenzy
Kill 10 enemies without dying in any ranked free for all playlist (Online). | 5 |
|
Killtacular
On a Mythic map, get a Killtacular during any ranked or social match. | 25 |
|
Landfall
Finish the first mission of the Campaign on Normal, Heroic, or Legendary. | 20 |
|
Last Stand
Finish the seventh mission of the Campaign on Normal, Heroic, or Legendary. | 40 |
|
Lee R Wilson Memorial
Score 5 grenade sticks in any ranked free for all playlist (Online). | 5 |
|
Longshore Skull
On Longshore, find the hidden skull. | 25 |
|
Look Both Ways
On a Legendary map, get a Splatter Spree during any ranked or social match. | 50 |
|
Marathon Man
Locate and access all Terminals in the Campaign. | 40 |
|
Maybe Next Time Buddy
Board the same vehicle within 10 seconds after being boarded in any free for all playlist (Online). | 5 |
|
Mongoose Mowdown
Splatter an enemy with the mongoose in a ranked free for all playlist (Online). | 5 |
|
MVP
Earn the MVP in any ranked playlist (Online). | 5 |
|
Mythic
Find and claim this skull when playing on Normal, Heroic or Legendary difficulty. | 10 |
|
Orbital Skull
On Orbital, find the hidden skull. | 25 |
|
Orpheus
Score over 15,000 points in the Campaign meta-game on the eighth mission. | 10 |
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Overkill
Kill 4 enemies within 4 seconds of one another in a ranked free for all playlist (Online). | 5 |
|
Post Mortem
On Orbital, get 2 Death From the Grave medals during any ranked or social match. | 25 |
|
Pull
On Citadel, get a Shotgun Spree during any ranked or social match. | 25 |
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Ranger
Score over 50,000 points in the Campaign meta-game on the sixth mission. | 10 |
|
Reclaimer
Score over 15,000 points in the Campaign meta-game on the final mission. | 10 |
|
Refuge
Finish the sixth mission of the Campaign on Normal, Heroic, or Legendary. | 30 |
|
Return
Finish the final mission of the Campaign on Normal, Heroic, or Legendary. | 50 |
|
Road Rage
On a Legendary map, get 5 Warthog chaingun kills during any ranked or social match. | 25 |
|
Sandbox Skull
On Sandbox, find the hidden skull. | 25 |
|
Save This Film
On a Mythic map, get a Perfection medal during any ranked or social match. | 25 |
|
Spartan Officer
Advance to the Spartan Officer ranks (Online). | 25 |
|
Steppin' Razor
Score a Triple Kill with the sword in a ranked free for all playlist (Online). | 5 |
|
Tank Dropper
On any Mythic map, get a kill on another player while in monitor mode. | 25 |
|
The Key
Finish the eighth mission of the Campaign on Normal, Heroic, or Legendary. | 40 |
|
The Road
Finish the third mission of the Campaign on Normal, Heroic, or Legendary. | 20 |
|
Thunderstorm
Find and claim this skull when playing on Normal, Heroic or Legendary difficulty. | 10 |
|
Tilt
Find and claim this skull when playing on Normal, Heroic or Legendary difficulty. | 10 |
|
Too Close to the Sun
Destroy an enemy banshee with the spartan laser or missile pod in a ranked playlist or in campaign. | 5 |
|
Tough Luck
Find and claim this skull when playing on Normal, Heroic or Legendary difficulty. | 10 |
|
Triple Kill
Kill 3 enemies within 4 seconds of one another in a ranked free for all playlist (Online). | 5 |
|
Two for One
Score a Double Kill with a single spartan laser shot in a ranked free for all playlist (Online). | 5 |
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UNSC Spartan
Earn your Sergeant rating to be recognized as a true Spartan (Online). | 15 |
|
Up Close and Personal
Kill 5 enemies by melee or assassination in a ranked free for all playlist (Online). | 5 |
|
Used Car Salesman
Destroy a vehicle that has three enemies in it in a ranked playlist or in campaign. | 5 |
|
Vanguard
Score over 50,000 points in the Campaign meta-game on the seventh mission. | 10 |
|
Vidmaster Challenge: 7 on 7
Enter into any ranked or social playlist with 7 EXP on the 7th of the month. | 0 |
|
Vidmaster Challenge: Annual
After 9/25/08, complete Halo on 4-player Legendary LIVE co-op, with Iron, and everyone in Ghosts. | 0 |
|
Vidmaster Challenge: Brainpan
Find all the hidden skulls on the Mythic maps. | 25 |
|
Vidmaster Challenge: Lightswitch
Get to the rank of Lieutenant in any playlist in the new EXP progression system. | 0 |
|
We’re in for some Chop
Destroy an enemy vehicle with equipment in a ranked playlist or in campaign. | 5 |
|
Zombie Repeller
On a Mythic map, kill 2 Zombies during any ranked or social match. | 25 |
