Complete the game on Hard
Complete Mission 10 on Hard
Complete Mission 9 on Hard
Complete Mission 8 on Hard
Complete Mission 7 on Hard
Complete Mission 6 on Hard
Complete Mission 5 on Hard
Complete the game without being killed by an Infected
Complete the game twice
Complete Mission 4 on Hard
Complete Mission 3 on Hard
Complete Mission 2 on Hard
Complete Mission 1 on Hard
Complete Mission 10 on Normal
Complete the game on Easy
Complete the game on Normal
Complete Mission 9 on Normal
Complete Mission 8 on Normal
Complete Mission 7 on Normal
Find and pick up every weapon
Complete Mission 6 on Normal
Beat down 15 enemies
Complete Mission 5 on Normal
Kill 15 enemies with one belt of a non-mounted Heavy Machine Gun
Complete Mission 4 on Normal
Complete Mission 3 on Normal
Complete Mission 2 on Normal
Dismember 50 enemies
Kill 3 enemies with one rocket or grenade
Kill 150 enemies
Score 15 decapitating head shots
Kill 15 enemies with the machete
Kill 5 enemies with one M16 clip
Kill 5 enemies with one AK47 clip
Score a decapitating head shot
Complete a level firing only a pistol
Complete a level without dying
Complete Mission 1 on Normal
Kill 3 enemies with one pistol clip
Beat down an enemy