8.52%
Serious Co-op
Complete TFE, TSE and BFE campaigns in co-op on unmodified serious difficulty.
9.18%
Survivor
Earn a gold medal on any level in single player Survival.
9.18%
Are You Serious!?
Complete TFE, TSE and BFE single player campaigns on unmodified serious difficulty.
9.18%
Co-op Survivor
Earn a gold medal on any level in cooperative Survival.
9.67%
Serious Run
Complete TFE, TSE and BFE single player campaigns in the estimated time on each level.
10.33%
Metropolis King
Complete the Metropolis level in single player on unmodified serious difficulty.
10.33%
Fragger
Frag a total of 100 players.
11.15%
Serious Sam
Complete TFE, TSE and BFE single player campaigns.
11.31%
The Beast
Finish the Legend of the Beast campaign in single player or cooperative.
11.31%
Jewel of the Nile
Complete the Jewel of The Nile single player campaign.
11.80%
Co-op Hippy
Complete a level in co-op with blood option set to hippy.
12.62%
Maintenance time
Blow a Major Biomechanoid into pieces.