3.12%
Developer Rage
Find and kill a Serious Sam developer in versus multiplayer.
7.03%
Bright Island
Finish the Bright Island campaign in single player.
7.55%
Friendly Bright Island
Finish the Bright Island campaign in cooperative.
7.55%
Familiar Scenery
Find Bright Island's first secret level.
7.55%
Not Quite A Resort
Find Bright Island's second secret level.
8.59%
Sam I Am
Kill 100.001 enemies.
9.38%
Friendly Mine Trap
Kill 50 players with mines.
9.64%
Mine Trap
Kill 100 monsters with mines.
9.64%
Stop jumping!
Kill 5000 marsh-hoppers with the chainsaw.
9.90%
Serious Killer
Kill 500 people.
9.90%
I am Ugh-Zan
In singleplayer, beat the last level of The First Encounter or the last level in The Second Encounter in the "I am Ugh-Zan" difficulty.
9.90%
Newton's worst enemy
Mess with the gravity for a total of 60 minutes.