Complete the following achievements to unlock Xbox Live Gamerscore points.

Achievement	How to unlock
The Dead Man (10 points)	Kill 5 Bloaters (Breakdown Level 2 or Higher).
The Judge (10 points)	Perform 50 Zombie Executions (Breakdown Level 3 or Higher).
The Mercenary (10 points)	Kill 5 Juggernauts (Breakdown Level 5 or Higher).
The Ninja (10 points)	Stealth Kill 50 Zombies (Breakdown Level 5 or Higher).
The Rescuer (25 points)	Unlock All Heroes.
The Sacrifice (10 points)	let your character die with a throw-able explosive, then use it just before dying (Breakdown Level 1 or Higher).
The Scientist (15 points)	Reach Breakdown Level 6.
The Survivor (10 points)	Collect 150 Resources (Breakdown Level 4 or Higher).