Im late but..
Gameplay could be better, but it's good. Animation is good too. Bout the achievements:
Brutal - kill the pink hair guy, then shoot at his body! >:D
Marc Summers - at the left restroom, press the switches of the man-toilet(???) multiple times.
Overkill - After u defeat telepatic guy, shoot at the chairs he's covered with until u kill him.
Scat man - at the left toilet open the closer to screen door, talk to the dude (dont kill lol) until he throws shit. When there's no more shit again, close the door, open it and talk again ceveral times
tap that - open a washer (???) i mean the thing u wash hands in...
bruckheimer - during last boss fight, destroy the big creepy-looking thing on the left.
Hope that helps