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

55 Gamerscore

Complete Siberian Mayhem on Serious difficulty in Singleplayer
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Massacre Party

55 Gamerscore
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Old School

65 Gamerscore
More achievements
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Welcome to the Jungle

15 Gamerscore
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No Stone Unturned

60 Gamerscore
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Ok, And?

10 Gamerscore
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Eye for an Eye

5 Gamerscore
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The Processing

10 Gamerscore
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Black Gold

10 Gamerscore
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Superior Species

15 Gamerscore
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Here Comes the Pain

15 Gamerscore