View full achievement list for Serious Sam: Siberian Mayhem
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Hero-glyphic

15 Gamerscore

Get any medal on Horus Sanctuary survival level
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Superior Species

15 Gamerscore
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Here Comes the Pain

15 Gamerscore
More achievements
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Massacre Party

55 Gamerscore
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Old School

65 Gamerscore
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Dogs and Frogs

5 Gamerscore
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More Complaints

20 Gamerscore
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Alpha and Omega

10 Gamerscore
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Feng Shui Fight

15 Gamerscore
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Hide and Seek

10 Gamerscore
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Veni, Vidi, Vici

50 Gamerscore