Serious Sam: Siberian Mayhem
Windows
- 15,554 Achievements Earned
- 1,420 Players Tracked
- 49 Total Achievements
- 7,454 Obtainable EXP
- 1,000 Gamerscore
- 105 100% Club
Complete Siberian Mayhem on Serious difficulty in co-op with enemy multiplier set to at least x2
55
8.31%
Very Rare - 278.00 EXP
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