Serious Sam: Siberian Mayhem
Windows
- 15,779 Achievements Earned
- 1,429 Players Tracked
- 49 Total Achievements
- 7,403 Obtainable EXP
- 1,000 Gamerscore
- 107 100% Club
Complete Siberian Mayhem on Serious difficulty in co-op with enemy multiplier set to at least x2
55
8.40%
Very Rare - 277.00 EXP
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