All the 17 hidden achievements

1 shot, 1 kill - Get 650 kills with the .50cal

Dangerous Eagle - Get 200 kills with the Desert Eagle

Demon Hunter - Get 666 kills with the Crossbow

Give me everything - and you get nothing instead...

Helmut did a good job - Get 200 kills with the USP

Hip Firing - Get 300 kills with the HK SMGII

It's very Sauer - Get 200 kills with the P225

John's Favorite Little Classic - Get 200 kills with the 1911

Look what you did to him! - NO DESCRIPTION

Machinepistole - Get 300 kills with the HK MP510

Schienzel - At least he ain't a zombie

Sheriff's right Hand - Get 430 kills with the .357

Standard Issue - Get 300 kills with the M4

Time to get stoned - Get 200 kills with the SR-25

Tiny but deadly - Get 300 kills with the HK 45

Turtle Lover - You can't stop this hum train

Uzi the man? Get 300 kills with the Uzi