Complete the Campaign on Heroic Difficulty
Complete the Campaign on Legendary Difficulty
Complete entire Campaign in Co-op Mode
Mission 5: Jack 6 Covenant Vehicles
Get a winning High Score with 10 or less Squads against the Heroic AI
Win a Heroic Skirmish Game against the AI in under 10 minutes
Mission 6: Successfully protect every Rhino
Gain at least 15 population from a single wave in a Reinforcement game.
Finish with 5000 net resources tributed to your teammates on Memorial Basin except in Deathmatch.
Win a Skirmish Game with every Leader
Mission 4: Save Adam
Obtain a Lifetime Campaign Score over 1,000,000
Mission 8: Use Elephants to train 100 Infantry
Mission 15: Open the Doors in order
Mission 10: Disrupt all Tractor Beams
Mission 11: Save all the Airlocks
Obtain the Lieutenant Rank on Xbox LIVE
Use one of the 6 Major Leader Powers to destroy an enemy's last unit
Play Halo Wars for at least 24 Total Hours
Improve your Score in any Campaign Mission
Win a Skirmish Game with Dual Scarabs
Win a Matchmade Skirmish Game on Xbox LIVE
Win and have the Highest Score in a Matchmade Skirmish Game on Xbox LIVE
Unlock 20 Timeline Events
Mission 9: Put every Colony in Hibernation Mode at the same time
Mission 13: Destroy 25 units with the Scarab
Mission 14: Don't claim an extra base
Win a game in every Skirmish Game Mode
Get a Gold Medal on any mission
Mission 2: Destroy every Methane Tank
Mission 3: Kill at least 5 Covenant Units with the Bridge
Complete any Campaign Mission in Co-op Mode
Win a 3v3 Skirmish game with 2 AI Allies
Obtain the Recruit Rank on Xbox LIVE
Collect your first Skull
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 50 Grunts with Warthogs
Mission 7: Do not destroy any Power Node
Mission 12: Repair the Power Core in less than 4 minutes
Win a game on every Skirmish Map
Get 20,000 points in any Skirmish Game
Obtain the General Rank on Xbox LIVE
Collect all Skulls
Unlock All Timeline Events
100% Completion
Score the winning point in a game of Keepaway against Legendary AIs.
Win and never trail in a Tug of War game.
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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