Complete the following achievements to unlock Xbox Live Gamerscore points.

Achievement	How to unlock
And You Will Know Us... ( 13 points )	Impale 13 freaks.
Cemetery Man ( 20 points )	Complete St. Crux Cemetery using only the Chainsaw.
Got the Hat ( 40 points )	Beat the game on Samurai difficulty.
Kill You Seven Times ( 14 points )	Air juggle an enemy for 10 seconds.
Master of Arcade Dishwashing ( 15 points )	Complete Arcade mode.
Smasher of Zombies ( 25 points )	Beat the game on normal or ninja difficulty.
Smash Your TV ( 13 points )	Unknown.
The Peter Moore Achievement ( 8 points )	Pay homage to one of our generation's greatest rock performances ever.
The Black Book Achievement ( 11 points )	Earn 100 million points in an Arcade level.
The Brutal Achievement ( 10 points )	Do 10 wall slams in one combo.
The First Encounter ( 10 points )	Unknown.
Untouchable ( 21 points )	Get 21 kills without getting hit once.