10 GuerillaIn the Campaign meta-game on the 1st mission score over 15,000 points.
10 DemonIn the Campaign meta-game on the 2nd mission score over 15,000 points.
10 CavalierIn the Campaign meta-game on the 3rd mission score over 15,000 points.
10 AskarIn the Campaign meta-game on the 4th mission score over 15,000 points.
10 ExterminatorIn the Campaign meta-game on the 5th mission Score over 15,000 points.
10 RangerIn the Campaign meta-game on the 6th mission score over 50,000 points.
10 VanguardIn the Campaign meta-game on the 7th mission score over 50,000 points.
10 OrpheusIn the Campaign meta-game on the 8th mission score over 15,000 points.
10 ReclaimerIn the Campaign meta-game on the final mission score over 15,000 points.
10 IronWhen playing on Normal, Heroic or Legendary difficulty find and claim this skull.
10 Black EyeWhen playing on Normal, Heroic or Legendary difficulty find and claim this skull.
10 Tough LuckWhen playing on Normal, Heroic or Legendary difficulty find and claim this skull.
10 CatchWhen playing on Normal, Heroic or Legendary difficulty find and claim this skull.
10 FogWhen playing on Normal, Heroic or Legendary difficulty find and claim this skull.
10 FamineWhen playing on Normal, Heroic or Legendary difficulty find and claim this skull.
10 ThunderstormWhen playing on Normal, Heroic or Legendary difficulty find and claim this skull.
10 TiltWhen playing on Normal, Heroic or Legendary difficulty find and claim this skull.
10 MythicWhen playing on Normal, Heroic or Legendary difficulty find and claim this skull
10 GraduateEarn 5 EXP or finish 10 games to complete the requirements for basic training (Online).
125 Campaign Complete: NormalFinish the Campaign on Normal.
125 Campaign Complete: HeroicFinish the Campaign on Heroic. This also unlocks the achievement for Normal if not yet earned.
125 Campaign Complete: LegendaryFinish the Campaign on Legendary. This also unlocks the achievements for Normal and Heroic if not yet earned.
15 UNSC SpartanEarn your Sergeant rating to be recognized as a true Spartan (Online).
20 LandfallOn Normal, Heroic or Legendary complete the 1st mission of the Campaign.
20 HoldoutOn Normal, Heroic or Legendary complete the 2nd mission of the Campaign.
20 The RoadOn Normal, Heroic or Legendary complete the 3rd mission of the Campaign.
25 Spartan OfficerAdvance to the Spartan Officer ranks (Online).
30 AssaultOn Normal, Heroic or Legendary complete the 4th mission of the Campaign.
30 CleansingOn Normal, Heroic or Legendary complete the 5th mission of the Campaign.
30 RefugeOn Normal, Heroic or Legendary complete the 6th mission of the Campaign.
40 Last StandOn Normal, Heroic or Legendary complete the 7th mission of the Campaign.
40 The KeyOn Normal, Heroic or Legendary complete the 8th mission of the Campaign.
40 Marathon ManLocate and access ALL the Terminals in the Campaign.
5 MVPIn any ranked playlist (Online) earn the MVP.
5 Maybe Next Time BuddyIn any free for all playlist (Online) board the same vehicle within 10 seconds after being boarded.
5 Triple KillIn a ranked free for all playlist (Online) Kill 3 enemies within 4 seconds of one another.
5 OverkillIn a ranked free for all playlist (Online) Kill 4 enemies within 4 seconds of one another.
5 Killing FrenzyIn any ranked free for all playlist (Online) kill 10 enemies without dying.
5 Lee R Wilson MemorialIn any ranked free for all playlist (Online) score 5 Grenade Sticks.
5 Steppin' RazorIn a ranked free for all playlist (Online) score a Triple Kill with the Sword.
5 Mongoose MowdownIn a ranked free for all playlist (Online) splatter an enemy with the Mongoose.
5 Up Close and PersonalIn a ranked free for all playlist (Online) kill 5 enemies by Melee or Assassination.
5 Two for OneIn a ranked free for all playlist (Online) score a Double Kill with a single Spartan Laser shot.
5 Too Close to the SunIn a ranked playlist or in campaign destroy an enemy Banshee with the Spartan Laser or Missile Pod.
5 Used Car SalesmanIn a ranked playlist or in campaign destroy a vehicle that has 3 enemies in it.
5 We’re in for some ChopIn a ranked playlist or in campaign destroy an enemy vehicle with equipment.
5 Fear the Pink MistIn a ranked free for all playlist or in campaign kill 5 enemies with the needler.
5 Headshot HonchoIn a ranked free for all playlist or in campaign kill 10 enemies with headshots.
50 ReturnOn Normal, Heroic or Legendary complete the final mission of the Campaign.