Complete the Campaign on Heroic Difficulty.
Complete the Campaign on Legendary Difficulty.
Mission 13: Destroy 25 units with the Scarab.
Finish five missions under Par Time on Heroic difficulty.
Collect all Skulls.
Use one of the 6 Major Leader Powers to destroy an enemy's last unit.
Obtain a lifetime campaign Score over 1,000,000.
Mission 11: Save all the Airlocks.
Mission 10: Distrupt all Tractor Beams.
Mission 9: Put every Colony in Hibernation Mode at the same time.
Play Halo Wars for at least 24 Total hours.
Finish with 5000 net resources tributed to your teammates on Memorial Basin except in Deathmatch.
Win a Skirmish Game with every Leader.
Win a Skirmish Game with Dual Scarabs.
Win 10 Skirmish or Multiplayer Matches
Win a 3v3 Skirmish game with 2 AI Allies.
Unlock 20 Timeline Events.
Win a Heroic Skirmish Game against the AI in under 10 minutes.
Get a winning High Score with 10 or less Squads against the Heroic AI.
Mission 15: Open the Doors in order.
Collect 8 Skulls.
Mission 12: Repair the Power Core in less than 4 minutes.
Improve your Score in any Campaign Mission.
Mission 3: Kill at least 5 Covenant Units with the Bridge.
Collect your first Skull.
Get a Gold Medal on any mission.
Complete any Campaign Mission in Co-op Mode.
Finish one mission under Par Time on Heroic difficulty.
Gain at Least 15 population from a single wave in a Reinforcement game.
Unlock a Timeline Event.
Finish all missions under Par Time on Heroic difficulty.
Get a Gold Medal with all Debuff Skulls Active.
Get a Gold Medal on every Campaign Mission.
Mission 1: Ram and kill 50 Grunts with Warthogs.
Mission 2: Destroy every Methane Tank.
Mission 4: Save Adam.
Mission 5: Jack 6 Covenant Vehicles.
Mission 6: Successfully protect every Rhino.
Mission 7: Do not destroy any Power Node.
Mission 8: Use Elephants to train 100 infantry.
Mission 14: Don't claim an extra base.
Score the winning point in a game of Keepaway against Legendary AI's.
Win a game on every Skirmish Map.
Win a game in every Skirmish Game Mode.
Get 20,000 points in any Skirmish Game.
Unlock All Timeline Events.
100% Completion.
Win a Public game.
Win and have the highest score in a Public Game.
Win 20 Skirmish or Multiplayer Matches
Win 30 Skirmish or Multiplayer Matches
Win 40 Skirmish or Multiplayer Matches.
Win 50 Skirmish or Multiplayer Matches.
Win and never trail in a Tug of War game.
Win 100 Skirmish or Multiplayer Matches.
Win 75 Skirmish or Multiplayer Matches.
Get a Scarab during a Reinforcement game.
Hot drop 50 squads to your Covenant Leader in a single game on Barrens.
Kill 20 enemy squads with a continuous Covenant Leader Power on Memorial Basin.
Disrupt 5 active Leader Powers in a single game on Blood River.
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