Got the Hat
Beat the game on Samurai difficulty.
40 
Smasher of Zombies
Beat the game on normal or ninja difficulty.
25 
Untouchable
Get 21 kills without getting hit once.
21 
Cemetery Man
Complete St. Crux Cemetery using only the Chainsaw.
20 
Master of Arcade Dishwashing
Complete Arcade mode.
15 
Kill You Seven Times
Air juggle an enemy for 10 seconds.
14 
And You Will Know Us...
Impale 13 freaks.
13 
Smash Your TV
Defeat the Sinthesis A.I.
13 
The Black Book Achievement
Earn 100 million points in an Arcade level.
11 
The First Encounter
Defeat the dude on the horse.
10 
The Brutal Achievement
Do 10 wall slams in one combo.
10 
The Peter Moore Achievement
Hit the Xbox Guide button while playing a killer solo.
8