Beat the game on normal or ninja difficulty.
Hit the Xbox Guide button while playing a killer solo.
Beat the game on Samurai difficulty.
Defeat the dude on the horse.
Earn 100 million points in an Arcade level.
Defeat the Sinthesis A.I.
Complete St. Crux Cemetery using only the Chainsaw.
Do 10 wall slams in one combo.
Air juggle an enemy for 10 seconds.
Get 21 kills without getting hit once.
Complete Arcade mode.
Impale 13 freaks.