Complete the following achievements to unlock Xbox Live Gamerscore points.

Achievement	How to unlock
Assassin ( 10 points )	Kill 10 soldiers using stealth in story mode.
Bonus Hunter ( 20 points )	Find and collect 36 bonus ulyssium.
Carnage ( 20 points )	Kill 300 soldiers in story mode.
Combo Slayer ( 10 points )	Kill 10 soldiers using combo attack in story mode.
Hollywood Star ( 10 points )	Get spotted by security cameras at least 10 times in story mode.
Martial art Master ( 20 points )	Unlock all combat moves in story mode.
No Mercy ( 30 points )	Finish all three chapters with combat rank S in story mode.
Path of Justice ( 20 points )	Finish the game on any difficulty.
Path of Revenge ( 30 points )	Finish the game on Veteran difficulty.
Rank Captain ( 10 points )	Kill the Prison Boss.
Rank Lieutenant Colonel ( 10 points )	Kill the Nuclear Base Boss.
Rank Major ( 10 points )	Kill the Laboratory Boss.