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

35 Gamerscore

Find half of all the secrets
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No Stone Unturned

60 Gamerscore
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Ok, And?

10 Gamerscore
More achievements
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Death from Above

10 Gamerscore
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The Refinery

10 Gamerscore
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All Ingenious is Shot

10 Gamerscore
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Extreme Survivalist

40 Gamerscore
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Back To The Future

10 Gamerscore
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Iron Caput

40 Gamerscore
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Hide and Seek

10 Gamerscore
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Look Ma, I'm a Lumberjack!

30 Gamerscore