View full achievement list for Serious Sam: Siberian Mayhem
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Old School

65 Gamerscore

Complete Siberian Mayhem without learning a single S.A.M skill in Singleplayer
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Serious Mayhem

55 Gamerscore
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Veni, Vidi, Vici

50 Gamerscore
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Black Gold

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The Last Train Departed

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Eye for an Eye

5 Gamerscore
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The Processing

10 Gamerscore
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Extremely Uncool

5 Gamerscore
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Serious Mayhem

55 Gamerscore
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The End

10 Gamerscore