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