Complete the following achievements to unlock Xbox Live Gamerscore points.

Achievement	How to unlock
Arcade Master ( 20 points )	Complete any Arcade Chapter below the target time ( General).
Collector ( 30 points )	Collect all Marks of the Gods ( Single Player only).
Don't Go Alone ( 10 points )	Complete any Co-op Challenge Room ( General).
Enthusiast ( 10 points )	Collect 10 Marks of the Gods ( Single Player only).
Environmental Exterminator ( 5 points )	Destroy a Spider using spikes ( General).
Grand Master ( 30 points )	Complete the full game ( Individual).
Millionaire ( 30 points )	Collect 1 000 000 Doubloons ( Single Player only).
Overkill ( 15 points )	Destroy six enemies with one Beam Shot ( Individual).
Survivor ( 10 points )	Kill 20 enemies in a row with only 1 health left ( Individual).
That's Teamwork ( 5 points )	Destroy an enemy using a Kamikazer ( General).
Two Birds ( 10 points )	Smack a bomb so that kills two or more enemies ( Individual).
Untouchable ( 25 points )	Defeat any boss without taking damage ( General).