10 achievements for 1000 Gamerscore
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Tortoise Boss Defeated
Defeated the first boss
50 Gamerscore
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Hunter Boss Defeated
Defeated the second boss
60 Gamerscore
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Weapon Platform Defeated
Defeated the third boss
70 Gamerscore
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Carrier Ship Defeated
Defeated the fourth boss
90 Gamerscore
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Rotating Boss Defeated
Defeated the fifth boss
100 Gamerscore
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Shield Battery Defeated
Defeated the sixth boss
110 Gamerscore
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Spidertank Defeated
Defeated the seventh boss
120 Gamerscore
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Oxelg Brain Defeated
Defeated the final boss
150 Gamerscore
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Self-Sacrifice
Completed the mission by sacrificing self
50 Gamerscore
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Survivalist
Survived and continued the journey
200 Gamerscore