Complete the following achievements to unlock Xbox Live Gamerscore points.

Achievement	How to unlock	Points
Balls of Steel	Max out on orbital pulsars	35
Bounty - Beard	Defeat Beard	35
Bounty - Cerbero	Defeat Cerbero	35
Bounty - Cuvel Clark	Defeat Cuvel Clark	35
Bounty - Ex Cop	Defeat Ex Cop	35
Bounty - Flygirl	Defeat Flygirl	35
Bounty - Foetoid	Defeat Foetoid	35
Bounty - HK5	Defeat HK5	35
Bounty - Jo	Defeat Jo	35
Bounty - LA Jay	Defeat LA Jay	35
Bounty - Lokasenna	Defeat Lokasenna	35
Bounty - Mofisto	Defeat Mofisto	35
Bounty - Nim Soo	Defeat Nim Soo	35
Bounty - Nubia	Defeat Nubia	35
Bounty - Nutta	Defeat Nutta	35
Bounty - Rex Hardy	Defeat Rex Hardy	35
Bounty - Sceptre	Defeat Sceptre	35
Bounty - Slick	Defeat Slick	35
Death to the invader	Defeat the Ramqan	35
Exterminated	Defeat the Exogenon	35
Go-Getter	Unlock and complete all bonus levels in the single player campaign	35
In the flesh	Defeat the Fleshmorph	35
In the name of science	Defeat the Maldroid	35
Not a stupid blue alien	Defeat the Avatar	35
Surprisingly Impossible	Complete single player mission 'Fishy' on Total Mayhem without losing a life	35
The whole gang is here	Unlock all playable characters	35
Treasure Hunter	Discover all secret areas in a single player campaign	45
Why can't I hold all these crystals?	Collect all crystals in a single player campaign	45