Complete Chapter 5 - 2 on any difficulty setting.
Complete Chapter 5 - 1 on any difficulty setting.
Complete Chapter 4 - 2 on any difficulty setting.
Complete Chapter 4 - 1 on any difficulty setting.
Complete Chapter 3 - 3 on any difficulty setting.
Defeat 3 Majini at once with a drum or gas tank explosion.
Complete Chapter 3 - 2 on any difficulty setting.
Complete Chapter 3 - 1 on any difficulty setting.
Complete Chapter 2 - 3 on any difficulty setting.
Complete Chapter 2 - 2 on any difficulty setting.
Deflect a bow gun arrow with your knife.
Save partner 10 times when HELP is displayed.
Defeat 5 enemies with the Knife.
Pull off 20 headshots.
Shoot an enemy Molotov cocktail, dynamite stick, or hand grenade.
Complete Chapter 2 - 1 on any difficulty setting.
Complete Chapter 1 - 2 on any difficulty setting.
Defeat 20 enemies with physical attacks.
Complete Chapter 1 - 1 on any difficulty setting.
Killed 30 enemies with your Mulcher turret
Clear a Challenge in Challenge Mode.
Perform 100 Ultra Combos.
Find the Space Squirrel.
Perform 50 Ultra Combo finishes.
Unlock all characters.
Perform 10 Personal Actions.
Perform 100 successful Focus Attacks.
Achieve 10 Perfect victories.
Play Halo Wars for at least 24 Total Hours
Complete Visari Square on any difficulty level
Kill 5 Helghast in 15 seconds whilst on foot and maintaining at least 85% health
Kill 30 Helghast using the StA3 fixed gun emplacement
Complete Blood Meridian on any difficulty level
Kill the Blood Meridian heavy in under 1 minute
Complete Corinth River on any difficulty level
Kill 3 Helghast at once using the surrounding environment
Win a game on every Skirmish Map
Obtain the Recruit Rank on Xbox LIVE
Complete any Campaign Mission in Co-op Mode
Collect your first Skull
Play the game after a week long break.
Continue playing to unlock this secret achievement.
Get a Gold Medal on any mission
Fit together all the world 5 puzzle pieces and align the puzzle in its frame.
Fit together all the world 4 puzzle pieces and align the puzzle in its frame.
Fit together all the world 3 puzzle pieces and align the puzzle in its frame.
Fit together all the world 2 puzzle pieces and align the puzzle in its frame.
Travel all the way across World 6.
Travel all the way across World 5.