Serious Sam
30Complete the game in single player on serious difficulty.
Unlocked: 28 Oct 2012 16:40:15
Complete Metropolis level in single player on serious difficulty without loading.
Unlocked: 09 Jan 2012 05:40:53
Complete a co-op game on serious difficulty and extra enemy strength on 400%.
Unlocked: 16 Oct 2011 17:47:24
Perfect Kill
10Kill all enemies in Karnak in single player.
Unlocked: 13 Oct 2011 20:07:10
Pierce at least 10 enemies with a single cannonball.
Unlocked: 12 Oct 2011 14:13:07
Find at least 50 secrets in single player.
Unlocked: 11 Oct 2011 19:29:14
Co-op Hippie
10Complete The Great Pyramid in co-op with blood option set to hippie.
Unlocked: 09 Oct 2011 11:30:56
Complete any level in co-op.
Unlocked: 08 Oct 2011 10:30:32
Complete the game in single player without firing a single bullet or shell.
Unlocked: 07 Oct 2011 19:52:57
Serious Run
15Complete the game in single player by beating estimated time on each level.
Unlocked: 07 Oct 2011 19:52:57
Game Master
20Complete the game.
Unlocked: 07 Oct 2011 19:52:56
Complete any level in single player.
Unlocked: 02 Oct 2011 10:46:32