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Unlock a Timeline Event.

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Get a Gold Medal on any mission.

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Collect your first Skull.

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Win a Public game.

Win a 3v3 Skirmish game with 2 AI Allies.

Win and have the highest score in a Public Game.

Use one of the 6 Major Leader Powers to destroy an enemy's last unit.

Mission 13: Destroy 25 units with the Scarab.

Mission 9: Put every Colony in Hibernation Mode at the same time.

Finish one mission under Par Time on Heroic difficulty.

Win 10 Skirmish or Multiplayer Matches

Improve your Score in any Campaign Mission.

Mission 11: Save all the Airlocks.

Complete any Campaign Mission in Co-op Mode.

Mission 4: Save Adam.

Win a Skirmish Game with Dual Scarabs.

Mission 15: Open the Doors in order.

Mission 3: Kill at least 5 Covenant Units with the Bridge.

Unlock 20 Timeline Events.

Mission 6: Successfully protect every Rhino.

Win 20 Skirmish or Multiplayer Matches

Mission 10: Distrupt all Tractor Beams.

Play Halo Wars for at least 24 Total hours.

Finish five missions under Par Time on Heroic difficulty.

Win a Skirmish Game with every Leader.

Win 30 Skirmish or Multiplayer Matches

Collect 8 Skulls.

Obtain a lifetime campaign Score over 1,000,000.

Win a Heroic Skirmish Game against the AI in under 10 minutes.

Win 40 Skirmish or Multiplayer Matches.

Mission 2: Destroy every Methane Tank.

Get a winning High Score with 10 or less Squads against the Heroic AI.

Complete the Campaign on Heroic Difficulty.

Win 50 Skirmish or Multiplayer Matches.

Get 20,000 points in any Skirmish Game.

Mission 5: Jack 6 Covenant Vehicles.

Gain at Least 15 population from a single wave in a Reinforcement game.

Win and never trail in a Tug of War game.

Win 75 Skirmish or Multiplayer Matches.

Complete the Campaign on Legendary Difficulty.

Mission 14: Don't claim an extra base.

Get a Gold Medal on every Campaign Mission.

Collect all Skulls.

Finish with 5000 net resources tributed to your teammates on Memorial Basin except in Deathmatch.

Win a game in every Skirmish Game Mode.

Win 100 Skirmish or Multiplayer Matches.

Mission 8: Use Elephants to train 100 infantry.

Win a game on every Skirmish Map.

Disrupt 5 active Leader Powers in a single game on Blood River.

Mission 12: Repair the Power Core in less than 4 minutes.

Mission 7: Do not destroy any Power Node.

Get a Scarab during a Reinforcement game.

Finish all missions under Par Time on Heroic difficulty.

Hot drop 50 squads to your Covenant Leader in a single game on Barrens.

Mission 1: Ram and kill 50 Grunts with Warthogs.

Score the winning point in a game of Keepaway against Legendary AI's.

Kill 20 enemy squads with a continuous Covenant Leader Power on Memorial Basin.

Unlock All Timeline Events.

Get a Gold Medal with all Debuff Skulls Active.

100% Completion.