This game has 9 unobtainable achievements.
Air Bender
Kill 30 humans with only pneumatic weapons.
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Gunman
Kill 50 enemies with heavy automatic shotgun.
Shocking
Get 50 kills with Volt Driver.
Sterling Effort
Kill 50 mutants with your knife.
Sticks like a bur
Kill 15 enemies using sticky grenade.
Stunning
Get 25 kills with alternative fire of Volt Driver.
Last Man Standing
Complete the game in Ranger Mode Hardcore.
Survivor
Complete the game in Ranger Mode Easy.
Weaponsmith
Kill at least one enemy with each weapon available in the game.