Complete the game in single player without firing a single bullet or shell.
Unlocked: 16 Aug 2012 18:53:29
Serious Run
15Complete the game in single player by beating estimated time on each level.
Unlocked: 16 Aug 2012 18:53:29
Perfect Kill
10Kill all enemies in Karnak in single player.
Unlocked: 16 Aug 2012 16:16:43
Complete Metropolis level in single player on serious difficulty without loading.
Unlocked: 16 Aug 2012 14:56:37
Serious Sam
30Complete the game in single player on serious difficulty.
Unlocked: 16 Aug 2012 13:35:33
Find at least 50 secrets in single player.
Unlocked: 15 Aug 2012 20:40:37
Pierce at least 10 enemies with a single cannonball.
Unlocked: 15 Aug 2012 19:25:02
Complete any level in single player.
Unlocked: 14 Aug 2012 13:11:22
Co-op Hippie
10Complete The Great Pyramid in co-op with blood option set to hippie.
Unlocked: 07 Apr 2012 15:09:14
Game Master
20Complete the game.
Unlocked: 07 Apr 2012 14:43:45
Complete a co-op game on serious difficulty and extra enemy strength on 400%.
Unlocked: 07 Apr 2012 14:43:45
Complete any level in co-op.
Unlocked: 07 Apr 2012 10:47:27