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