View full achievement list for Serious Sam: Siberian Mayhem
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Look Ma, I'm a Lumberjack!

30 Gamerscore

Complete the mech sequence and kill all big enemies without shooting
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Iron Caput

40 Gamerscore
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Line up, please!

20 Gamerscore
More achievements
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The Processing

10 Gamerscore
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Ok, And?

10 Gamerscore
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Back To The Future

10 Gamerscore
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The Refinery

10 Gamerscore
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Aurora Borealis

15 Gamerscore
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Superior Species

15 Gamerscore
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All Ingenious is Hard

30 Gamerscore
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Heart of Russia

10 Gamerscore