Perfect Kill
10Kill all enemies in Karnak in single player.
Unlocked: 30 Nov 2014 17:43:01
Complete the game in single player without firing a single bullet or shell.
Unlocked: 06 Nov 2014 19:02:47
Serious Run
15Complete the game in single player by beating estimated time on each level.
Unlocked: 31 Oct 2014 16:13:22
Pierce at least 10 enemies with a single cannonball.
Unlocked: 31 Oct 2014 14:34:15
Find at least 50 secrets in single player.
Unlocked: 30 Oct 2014 22:21:28
Complete Metropolis level in single player on serious difficulty without loading.
Unlocked: 30 Oct 2014 00:20:09
Serious Sam
30Complete the game in single player on serious difficulty.
Unlocked: 29 Oct 2014 22:58:20
Complete a co-op game on serious difficulty and extra enemy strength on 400%.
Unlocked: 29 Oct 2014 14:30:06
Game Master
20Complete the game.
Unlocked: 29 Oct 2014 14:30:00
Co-op Hippie
10Complete The Great Pyramid in co-op with blood option set to hippie.
Unlocked: 29 Oct 2014 14:29:52
Complete any level in single player.
Unlocked: 28 Oct 2014 17:14:54
Complete any level in co-op.
Unlocked: 28 Oct 2014 13:04:57