 | Landfall
| 20  |
Finish the first mission of the Campaign on Normal, Heroic, or Legendary. |
 | Holdout
| 20  |
Finish the second mission of the Campaign on Normal, Heroic, or Legendary. |
 | The Road
| 20  |
Finish the third mission of the Campaign on Normal, Heroic, or Legendary. |
 | Assault
| 30  |
Finish the fourth mission of the Campaign on Normal, Heroic, or Legendary. |
 | Cleansing
| 30  |
Finish the fifth mission of the Campaign on Normal, Heroic, or Legendary. |
 | Refuge
| 30  |
Finish the sixth mission of the Campaign on Normal, Heroic, or Legendary. |
 | Last Stand
| 40  |
Finish the seventh mission of the Campaign on Normal, Heroic, or Legendary. |
 | The Key
| 40  |
Finish the eighth mission of the Campaign on Normal, Heroic, or Legendary. |
 | Return
| 50  |
Finish the final mission of the Campaign on Normal, Heroic, or Legendary. |
 | Campaign Complete: Normal
| 125  |
Finish the Campaign on Normal. |
 | Campaign Complete: Heroic
| 125  |
Finish the Campaign on Heroic (unlocks achievement for Normal, if not earned). |
 | Campaign Complete: Legendary
| 125  |
Finish the Campaign on Legendary (unlocks achievements for Normal and Heroic, if not earned). |
 | Iron
| 10  |
Finish the Campaign on Normal, Heroic, or Legendary, then find and claim this skull. |
 | Black Eye
| 10  |
Finish the Campaign on Normal, Heroic, or Legendary, then find and claim this skull. |
 | Tough Luck
| 10  |
Finish the Campaign on Normal, Heroic, or Legendary, then find and claim this skull. |
 | Catch
| 10  |
Finish the Campaign on Normal, Heroic, or Legendary, then find and claim this skull. |
 | Fog
| 10  |
Finish the Campaign on Normal, Heroic, or Legendary, then find and claim this skull. |
 | Famine
| 10  |
Finish the Campaign on Normal, Heroic, or Legendary, then find and claim this skull. |
 | Thunderstorm
| 10  |
Finish the Campaign on Normal, Heroic, or Legendary, then find and claim this skull. |
 | Tilt
| 10  |
Finish the Campaign on Normal, Heroic, or Legendary, then find and claim this skull. |
 | Mythic
| 10  |
Finish the Campaign on Normal, Heroic, or Legendary, then find and claim this skull. |
 | Spartan Program Recruit
| 10  |
Win your first game in matchmaking to sign up for the Spartan Program (Online). |
 | UNSC Spartan
| 15  |
Earn your Sergeant rating to be recognized as a true Spartan (Online). |
 | Spartan Officer
| 25  |
Advance to the Spartan Officer ranks (Online). |
 | Two for One
| 5  |
Score a Double Kill with a single spartan laser shot in a ranked free for all playlist (Online). |
 | Too Close to the Sun
| 5  |
Destroy an enemy banshee with the spartan laser or missile pod in a ranked playlist or in campaign. |
 | Triple Kill
| 5  |
Kill 3 enemies within 4 seconds of one another in a ranked free for all playlist (Online). |
 | Overkill
| 5  |
Kill 4 enemies within 4 seconds of one another in a ranked free for all playlist (Online). |
 | Lee R Wilson Memorial
| 5  |
Score 5 grenade sticks in any ranked free for all playlist (Online). |
 | We’re in for some Chop
| 5  |
Destroy an enemy vehicle with equipment in a ranked playlist or in campaign. |
 | Killing Frenzy
| 5  |
Kill 10 enemies without dying in any ranked free for all playlist (Online). |
 | Steppin' Razor
| 5  |
Score a Triple Kill with the sword in a ranked free for all playlist (Online). |
 | Mongoose Mowdown
| 5  |
Splatter an enemy with the mongoose in a ranked free for all playlist (Online). |
 | Up Close and Personal
| 5  |
Kill 5 enemies by melee or assassination in a ranked free for all playlist (Online). |
 | Fear the Pink Mist
| 5  |
Kill 5 enemies with the needler in a ranked free for all playlist or in campaign. |
 | Headshot Honcho
| 5  |
Kill 10 enemies with headshots in a ranked free for all playlist or in campaign. |
 | Used Car Salesman
| 5  |
Destroy a vehicle that has three enemies in it in a ranked playlist or in campaign. |
 | Marathon Man
| 40  |
Locate and access all Terminals in the Campaign. |
 | MVP
| 5  |
Earn the MVP in any ranked playlist (Online). |
 | Maybe Next Time Buddy
| 5  |
Board the same vehicle within 10 seconds after being boarded in any free for all playlist (Online). |
 | Demon
| 10  |
Score over points in the Campaign meta-game on the second mission. |
 | Guerilla
| 10  |
Score over points in the Campaign meta-game on the first mission. |
 | Cavalier
| 10  |
Score over points in the Campaign meta-game on the third mission. |
 | Askar
| 10  |
Score over points in the Campaign meta-game on the fourth mission. |
 | Exterminator
| 10  |
Score over points in the Campaign meta-game on the fifth mission. |
 | Ranger
| 10  |
Score over points in the Campaign meta-game on the sixth mission. |
 | Vanguard
| 10  |
Score over points in the Campaign meta-game on the seventh mission. |
 | Orpheus
| 10  |
Score over points in the Campaign meta-game on eighth mission. |
 | Reclaimer
| 10  |
Score over points in the Campaign meta-game on the final mission. |