Improve your Score in any Campaign Mission

Unlocked: 08 Mar 2009 10:59:14

Win a game on every Skirmish Map

Unlocked: 08 Mar 2009 10:35:24

Win a 3v3 Skirmish game with 2 AI Allies

Unlocked: 08 Mar 2009 03:01:46

Win a Skirmish Game with every Leader

Unlocked: 08 Mar 2009 02:48:38

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

Unlocked: 07 Mar 2009 15:16:28

Play Halo Wars for at least 24 Total Hours

Unlocked: 07 Mar 2009 15:06:40

Unlock 20 Timeline Events

Unlocked: 07 Mar 2009 14:34:55

Win a game in every Skirmish Game Mode

Unlocked: 06 Mar 2009 15:06:30

Win a Matchmade Skirmish Game on Xbox LIVE

Unlocked: 04 Mar 2009 12:59:12

Obtain the Recruit Rank on Xbox LIVE

Unlocked: 04 Mar 2009 12:59:12

Win and have the Highest Score in a Matchmade Skirmish Game on Xbox LIVE

Unlocked: 04 Mar 2009 12:59:11

Completed Act I on any difficulty

Unlocked: 27 Feb 2009 13:45:42

Completed Mission 1 on any difficulty

Unlocked: Offline

Completed Act II on any difficulty

Unlocked: Offline

Completed Act III on any difficulty

Unlocked: Offline

Completed Act IV on any difficulty

Unlocked: Offline

Get a Gold Medal on any mission

Unlocked: Offline

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

Unlocked: Offline

Mission 10: Disrupt all Tractor Beams

Unlocked: Offline

Mission 15: Open the Doors in order

Unlocked: Offline

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

Unlocked: Offline

Collect your first Skull

Unlocked: Offline

Complete the Campaign on Heroic Difficulty

Complete the Campaign on Legendary Difficulty

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

Obtain a Lifetime Campaign Score over 1,000,000

Mission 1: Ram 50 Grunts with Warthogs

Mission 2: Destroy every Methane Tank

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

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 11: Save all the Airlocks

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

Mission 13: Destroy 25 units with the Scarab

Mission 14: Don't claim an extra base

Complete any Campaign Mission in Co-op Mode

Complete entire Campaign in Co-op Mode

Get 20,000 points in any Skirmish Game

Win a Skirmish Game with Dual Scarabs

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

Obtain the Lieutenant Rank on Xbox LIVE

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.

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

Get a Scarab during a Reinforcement game.

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

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

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.