11 achievements for 1000 Gamerscore
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Level Up
Level up at least once
90 Gamerscore
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Hard Landing
Die first time
90 Gamerscore
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Silent Assassin
Complete first room without taking any damage
90 Gamerscore
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Alien Commander
Defeat Alien Commander for good
90 Gamerscore
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Forbidden Temple
Reach the forbidden Temple
90 Gamerscore
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Prisoner One
Defeat Prisoner One for good
90 Gamerscore
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Alpha Twin
Defeat Alpha Twin
90 Gamerscore
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Temple Sentinel
Defeat Temple Sentinel for good
90 Gamerscore
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Bad Ending
Finish the game
90 Gamerscore
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Ultimate Challenge
Complete the ultimate challenge
90 Gamerscore
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New Game Plus
Finish the game in New Game Plus
100 Gamerscore