There are 40 achievements worth a total of 1000 points
Complete the game without being killed by an Infected
Complete game twice
Completed the game on Easy
Completed the game on Normal
Shell Shocked
Complete Mission 10 on Hard
Completed Mission 10 on Normal
Completed Mission 9 on Normal
Complete Mission 9 on Hard
Completed Mission 8 on Normal
Complete Mission 8 on Hard
Completed Mission 7 on Normal
Complete Mission 7 on Hard
Beaten down 15 enemies
Found and picked up every weapon
Completed Mission 6 on Normal
Complete Mission 6 on Hard
Completed Mission 5 on Normal
Complete Mission 5 on Hard
Killed 15 enemies with one belt of a non-mounted Heavy Machine Gun
Completed Mission 4 on Normal
Complete Mission 4 on Hard
Dismembered 50 enemies
Completed Mission 3 on Normal
Complete Mission 3 on Hard
Scored 15 decapitating head shots
Completed Mission 2 on Normal
Complete Mission 2 on Hard
Killed 3 enemies with one rocket or grenade
Killed 150 enemies
Complete a level firing only a pistol
Complete a level without dying
Kill 15 enemies with the machete
Completed Mission 1 on Normal
Complete Mission 1 on Hard
Killed 5 enemies with one M16 clip
Killed 5 enemies with one AK47 clip
Scored a decapitating head shot
Killed 3 enemies with one pistol clip
Beaten down an enemy