10 Thinkin' about My DoorbellMission 15: Open the Doors in order.
10 2 Bugs are Better Than 1Win a Skirmish Game with Dual Scarabs.
10 Basically NaïveWin 10 Skirmish or Multiplayer Matches
10 Big Al's ScooterWin a Heroic Skirmish Game against the AI in under 10 minutes.
10 Crushed ColorsImprove your Score in any Campaign Mission.
10 Hardly TardyFinish five missions under Par Time on Heroic difficulty.
10 My Virtual Friends Love MeWin a 3v3 Skirmish game with 2 AI Allies.
10 Penny PincherGet a winning High Score with 10 or less Squads against the Heroic AI.
110 Soldier of AresWin 75 Skirmish or Multiplayer Matches.
130 Weapon of ZeusWin 100 Skirmish or Multiplayer Matches.
15 Halo AcademicUnlock 20 Timeline Events.
15 Lovely Bunch of CoconutsCollect 8 Skulls.
15 Mr. PunctualFinish all missions under Par Time on Heroic difficulty.
15 Never Leave a Man BehindFinish with 5000 net resources tributed to your teammates on Memorial Basin except in Deathmatch.
15 Playin' the FieldWin a Skirmish Game with every Leader.
15 TitanGet 20,000 points in any Skirmish Game.
20 24 Hours of QualityPlay Halo Wars for at least 24 Total hours.
20 Freak on a StreakGain at Least 15 population from a single wave in a Reinforcement game.
20 KillJoyDisrupt 5 active Leader Powers in a single game on Blood River.
20 Own Worst EnemyGet a Gold Medal with all Debuff Skulls Active.
20 Pull Hard, Pull DeepWin and never trail in a Tug of War game.
25 Gallivant around the GalaxyWin a game on every Skirmish Map.
30 Adjudicate the ArbiterComplete the Campaign on Heroic Difficulty.
30 Drain CleanerKill 20 enemy squads with a continuous Covenant Leader Power on Memorial Basin.
30 GraverobberCollect all Skulls.
30 Living Loving BugGet a Scarab during a Reinforcement game.
30 Officer on DeckWin 20 Skirmish or Multiplayer Matches
30 One and DoneScore the winning point in a game of Keepaway against Legendary AI's.
30 Tour Coming ThroughHot drop 50 squads to your Covenant Leader in a single game on Barrens.
30 Walk-off WinnerUse one of the 6 Major Leader Powers to destroy an enemy's last unit.
30 Wall of RecognitionGet a Gold Medal on every Campaign Mission.
40 Epic GrinderObtain a lifetime campaign Score over 1,000,000.
40 Halo HistorianUnlock All Timeline Events.
5 Alas, Poor Andrew ThomasCollect your first Skull.
5 Battened Down the HatchesMission 11: Save all the Airlocks.
5 Beaming with PrideMission 13: Destroy 25 units with the Scarab.
5 Covenant 'Hot Drop'Mission 3: Kill at least 5 Covenant Units with the Bridge.
5 Didn't Get to Second BaseMission 14: Don't claim an extra base.
5 Empire BuilderWin a game in every Skirmish Game Mode.
5 Endless FunMission 2: Destroy every Methane Tank.
5 Everything's Better with BaconMission 1: Ram 50 Grunts with Warthogs.
5 Halo UndergraduateUnlock a Timeline Event.
5 Handy with ToolsMission 12: Repair the Power Core in less than 4 minutes.
5 He's Got the JackMission 5: Jack 6 Covenant Vehicles.
5 Micro ManagerMission 7: Do not destroy any Power Node.
5 Momma's BoyGet a Gold Medal on any mission.
5 Racing the ClockFinish one mission under Par Time on Heroic difficulty.
5 Ramblin' ManMission 8: Use Elephants to train 100 infantry.
5 Rhino HuggerMission 6: Successfully protect every Rhino.
5 Sweet NaptimeMission 9: Put every Colony in Hibernation Mode at the same time.
5 The ProcrastinatorMission 10: Distrupt all Tractor Beams.
5 The Real WinnerMission 4: Save Adam.
50 Detour the Great JourneyComplete the Campaign on Legendary Difficulty.
50 Running the ShowWin 30 Skirmish or Multiplayer Matches
70 Don’t Stop Me NowWin 40 Skirmish or Multiplayer Matches.
75 Ready for the Sequel100% Completion.
90 Maximum EffortWin 50 Skirmish or Multiplayer Matches.