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View full achievement list for Serious Sam: Siberian Mayhem
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Massacre Party
55
Complete Siberian Mayhem on Serious difficulty in co-op with enemy multiplier set to at least x2
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Oops, I dropped it
10 Gamerscore
Previous
Serious Mayhem
55 Gamerscore
More achievements
More Complaints
20 Gamerscore
Ok, And?
10 Gamerscore
The Dark Tower
20 Gamerscore
The Last Train Departed
10 Gamerscore
No Stone Unturned
60 Gamerscore
Veni, Vidi, Vici
50 Gamerscore
Serious Mayhem
55 Gamerscore
The Operator
5 Gamerscore
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