28 achievements for 1000 Gamerscore
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Not a stupid blue alien
Defeat the Avatar
35 Gamerscore
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Go-Getter
Unlock and complete all bonus levels in the single player campaign
35 Gamerscore
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Bounty - Beard
Defeat Beard
35 Gamerscore
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Bounty - Lokasenna
Defeat Lokasenna
35 Gamerscore
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Bounty - Cerbero
Defeat Cerbero
35 Gamerscore
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Bounty - Cuvel Clark
Defeat Cuvel Clark
35 Gamerscore
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Bounty - Slick
Defeat Slick
35 Gamerscore
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Bounty - Sceptre
Defeat Sceptre
35 Gamerscore
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Bounty - Mofisto
Defeat Mofisto
35 Gamerscore
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Bounty - Rex Hardy
Defeat Rex Hardy
35 Gamerscore
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Bounty - Jo
Defeat Jo
35 Gamerscore
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Bounty - HK5
Defeat HK5
35 Gamerscore
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Bounty - Ex Cop
Defeat Ex Cop
35 Gamerscore
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Bounty - LA Jay
Defeat LA Jay
35 Gamerscore
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Bounty - Nutta
Defeat Nutta
35 Gamerscore
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Bounty - Nubia
Defeat Nubia
35 Gamerscore
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Bounty - Nim Soo
Defeat Nim Soo
35 Gamerscore
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Bounty - Foetoid
Defeat Foetoid
35 Gamerscore
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Bounty - Flygirl
Defeat Flygirl
35 Gamerscore
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Why can't I hold all these crystals?
Collect all crystals in a single player campaign
45 Gamerscore
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Exterminated
Defeat the Exogenon
35 Gamerscore
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Surprisingly Impossible
Complete single player mission 'Fishy' on Total Mayhem without losing a life
35 Gamerscore
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In the flesh
Defeat the Fleshmorph
35 Gamerscore
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In the name of science
Defeat the Maldroid
35 Gamerscore
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Balls of Steel
Max out on orbital pulsars
35 Gamerscore
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Death to the invader
Defeat the Ramqan
35 Gamerscore
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Treasure Hunter
Discover all secret areas in a single player campaign
45 Gamerscore
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The whole gang is here
Unlock all playable characters
35 Gamerscore