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A complete list of achievements for Halo 3
| Achievement | Description | Points |
| Landfall | Finish the first mission of the Campaign on Normal, Heroic, or Legendary. | 20 |
| Holdout | Finish the second mission of the Campaign on Normal, Heroic, or Legendary. | 20 |
| The Road | Finish the third mission of the Campaign on Normal, Heroic, or Legendary. | 20 |
| Assault | Finish the fourth mission of the Campaign on Normal, Heroic, or Legendary. | 30 |
| Cleansing | Finish the fifth mission of the Campaign on Normal, Heroic, or Legendary. | 30 |
| Refuge | Finish the sixth mission of the Campaign on Normal, Heroic, or Legendary. | 30 |
| Last Stand |
Finish the seventh mission of the Campaign on Normal, Heroic, or Legendary. | 40 |
| The Key | Finish the eighth mission of the Campaign on Normal, Heroic, or Legendary. | 40 |
| Return | Finish the final mission of the Campaign on Normal, Heroic, or Legendary. | 50 |
| Campaign Complete: Normal | Finish the Campaign on Normal. | 125 |
| 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 |
| Iron | Find and claim this skull when playing on Normal, Heroic or Legendary difficulty. | 10 |
| Black Eye | Find and claim this skull when playing on Normal, Heroic or Legendary difficulty. | 10 |
| Tough Luck |
Find and claim this skull when playing on Normal, Heroic or Legendary difficulty. | 10 |
| Catch | Find and claim this skull when playing on Normal, Heroic or Legendary difficulty. | 10 |
| Fog | Find and claim this skull when playing on Normal, Heroic or Legendary difficulty. | 10 |
| Famine | Find and claim this skull when playing on Normal, Heroic or Legendary difficulty. | 10 |
| 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 |
| Mythic | Find and claim this skull when playing on Normal, Heroic or Legendary difficulty. | 10 |
| Graduate | Earn 5 EXP or finish 10 games to complete the requirements for basic training (Online). | 10 |
| UNSC Spartan |
Earn your Sergeant rating to be recognized as a true Spartan (Online). | 15 |
| Spartan Officer |
Advance to the Spartan Officer ranks (Online). | 25 |
| Two For One |
Score a Double Kill with a single spartan laser shot in a ranked free for all playlist (Online). | 5 |
| Too Close To The Sun |
Destroy an enemy banshee with the spartan laser or missile pod in a ranked playlist or in campaign. | 5 |
| Triple Kill |
Kill 3 enemies within 4 seconds of one another in a ranked free for all playlist (Online). | 5 |
| Overkill | Kill 4 enemies within 4 seconds of one another in a ranked free for all playlist (Online). | 5 |
| Lee R Wilson Memorial |
Score 5 grenade sticks in any ranked free for all playlist (Online). | 5 |
| We're In For Some Chop |
Destroy an enemy vehicle with equipment in a ranked playlist or in campaign. | 5 |
| Killing Frenzy |
Kill 10 enemies without dying in any ranked free for all playlist (Online). | 5 |
| Steppin' Razor |
Score a Triple Kill with the sword in a ranked free for all playlist (Online). | 5 |
| Mongoose Mowdown |
Splatter an enemy with the mongoose in a ranked free for all playlist (Online). | 5 |
| Up Close And Personal |
Kill 5 enemies by melee or assassination in a ranked free for all playlist (Online). | 5 |
| Fear The Pink Mist |
Kill 5 enemies with the needler in a ranked free for all playlist or in campaign. | 5 |
| Headshot Honcho |
Kill 10 enemies with headshots in a ranked free for all playlist or in campaign. | 5 |
| Used Car Salesman |
Destroy a vehicle that has three enemies in it in a ranked playlist or in campaign. | 5 |
| Marathon Man |
Locate and access all Terminals in the Campaign. | 40 |
| MVP |
Earn the MVP in any ranked playlist (Online). | 5 |
| Maybe Next Time Buddy |
Board the same vehicle within 10 seconds after being boarded in any free for all playlist (Online). | 5 |
| Guerilla |
Score over 15,000 points in the Campaign meta-game on the first mission. | 10 |
| Demon |
Score over 15,000 points in the Campaign meta-game on the second mission. | 10 |
| Cavalier |
Score over 15,000 points in the Campaign meta-game on the third mission. | 10 |
| Askar |
Score over 15,000 points in the Campaign meta-game on the fourth mission. | 10 |
| Exterminator |
Score over 15,000 points in the Campaign meta-game on the fifth mission. | 10 |
| Ranger |
Score over 15,000 points in the Campaign meta-game on the sixth mission. | 10 |
| Vanguard |
Score over 15,000 points in the Campaign meta-game on the seventh mission. | 10 |
| Orpheus |
Score over 15,000 points in the Campaign meta-game on the eighth mission. | 10 |
| Reclaimer |
Score over 15,000 points in the Campaign meta-game on the final mission. | 10 |
