Complete the following achievements to unlock Xbox Live Gamerscore points.

Achievement	How to unlock
Bite your finger (30 points)	Find the secret reptile.
Extreme Hoarder (20 points)	Pick up 50 weapons in Scavenger mode.
Handyman (20 points)	Unlock all xbow parts.
Home made javelin (20 points)	Destroy an enemy vehicle using the xbow.
Pocket full of death (30 points)	Without dying, get a kill with xbow, primary weapon, and hand grenade.