Win any mission, whether campaign or What-If

Use the last of your Supplies to refill a teammate's ammo rather than your own

Take down an enemy with gunfire while knocked down

Create your first custom class

Finish the single player campaign on any difficulty

Single Player: Kill 20 enemies with the Microwave cannon

Single Player: Kill two enemies with a single bullet

Defend Central Station

Reach the Hargreave-Rasch building

Infiltrate the alien hive

Find Nathan Gould

Single Player: Kill at least 3 enemies with a single grenade

Single Player: Kill 4 enemies in a row with headshots