Holdout20 Finish the second mission of the Campaign on
Normal, Heroic, or Legendary.
The Road20 Finish the third mission of the Campaign on
Normal, Heroic, or Legendary.
Assault30 Finish the fourth mission of the Campaign on
Normal, Heroic, or Legendary.
Cleansing30 Finish the fifth mission of the Campaign on
Normal, Heroic, or Legendary.
Refuge30 Finish the sixth mission of the Campaign on
Normal, Heroic, or Legendary.
Last Stand40 Finish the seventh mission of the Campaign on
Normal, Heroic, or Legendary.
The Key40 Finish the eighth mission of the Campaign on
Normal, Heroic, or Legendary.
Return50 Finish the final mission of the Campaign on
Normal, Heroic, or Legendary.
Campaign Complete: Normal125 Finish the Campaign on
Normal.
Campaign Complete: Heroic125 Finish the Campaign on Heroic (unlocks achievement for
Normal, if not earned).
Campaign Complete: Legendary125 Finish the Campaign on Legendary (unlocks achievements for
Normal and Heroic, if not earned).
Iron10 Find and claim this skull when playing on
Normal, Heroic or Legendary difficulty.
Black Eye10 Find and claim this skull when playing on
Normal, Heroic or Legendary difficulty.
Tough Luck10 Find and claim this skull when playing on
Normal, Heroic or Legendary difficulty.
Catch10 Find and claim this skull when playing on
Normal, Heroic or Legendary difficulty.
Fog10 Find and claim this skull when playing on
Normal, Heroic or Legendary difficulty.
Famine10 Find and claim this skull when playing on
Normal, Heroic or Legendary difficulty.
Thunderstorm10 Find and claim this skull when playing on
Normal, Heroic or Legendary difficulty.
Tilt10 Find and claim this skull when playing on
Normal, Heroic or Legendary difficulty.
Mythic10 Find and claim this skull when playing on
Normal, Heroic or Legendary difficulty.
Graduate10 Earn 5 EXP or finish 10 games to complete the requirements for basic training (Online).
UNSC Spartan15 Earn your Sergeant rating to be recognized as a true Spartan (Online).
Spartan Officer25 Advance to the Spartan Officer ranks (Online).
Two for One5 Score a Double Kill with a single spartan laser shot in a ranked free for all playlist (Online).
Too Close to the Sun5 Destroy an enemy banshee with the spartan laser or missile pod in a ranked playlist or in campaign.
Triple Kill5 Kill 3 enemies within 4 seconds of one another in a ranked free for all playlist (Online).
Overkill5 Kill 4 enemies within 4 seconds of one another in a ranked free for all playlist (Online).
Lee R Wilson Memorial5 Score 5 grenade sticks in any ranked free for all playlist (Online).
We’re in for some Chop5 Destroy an enemy vehicle with equipment in a ranked playlist or in campaign.
Killing Frenzy5 Kill 10 enemies without dying in any ranked free for all playlist (Online).
Steppin' Razor5 Score a Triple Kill with the sword in a ranked free for all playlist (Online).
Mongoose Mowdown5 Splatter an enemy with the mongoose in a ranked free for all playlist (Online).
Up Close and Personal5 Kill 5 enemies by melee or assassination in a ranked free for all playlist (Online).
Fear the Pink Mist5 Kill 5 enemies with the needler in a ranked free for all playlist or in campaign.
Headshot Honcho5 Kill 10 enemies with headshots in a ranked free for all playlist or in campaign.
Used Car Salesman5 Destroy a vehicle that has three enemies in it in a ranked playlist or in campaign.
Marathon Man40 Locate and access all Terminals in the Campaign.
MVP5 Earn the MVP in any ranked playlist (Online).
Maybe Next Time Buddy5 Board the same vehicle within 10 seconds after being boarded in any free for all playlist (Online).
Guerilla10 Score over 15,000 points in the Campaign meta-game on the first mission.
Demon10 Score over 15,000 points in the Campaign meta-game on the second mission.
Cavalier10 Score over 15,000 points in the Campaign meta-game on the third mission.
Askar10 Score over 15,000 points in the Campaign meta-game on the fourth mission.
Exterminator10 Score over 15,000 points in the Campaign meta-game on the fifth mission.
Ranger10 Score over 50,000 points in the Campaign meta-game on the sixth mission.
Vanguard10 Score over 50,000 points in the Campaign meta-game on the seventh mission.
Orpheus10 Score over 15,000 points in the Campaign meta-game on the eighth mission.
Reclaimer10 Score over 15,000 poi nts in the Campaign meta-game on the final mission.
I MUST THANK THE GUY WHO I GOT ALL THIS INFORMATION FROM. I FORGET HIM AND I DON'T KNOW HIM PERSONALLY, BUT IF HE EVER COMES BY THIS, I SAY THANK YOU VERY MUCH!!!