10
Serious Beginner
Complete any level in single player.
20
Game Master
Complete the game.
30
Serious Sam
Complete the game in single player on serious difficulty.
10
I am Invincible
Complete the game in single player without firing a single bullet or shell.
15
Serious Run
Complete the game in single player by beating estimated time on each level.
20
Metropolis King
Complete Metropolis level in single player on serious difficulty without loading.
5
Cannon Expert
Pierce at least 10 enemies with a single cannonball.
10
Perfect Kill
Kill all enemies in Karnak in single player.
30
Look, It's a Secret
Find at least 50 secrets in single player.
5
Co-op Beginner
Complete any level in co-op.
10
Co-op Hippie
Complete The Great Pyramid in co-op with blood option set to hippie.
35
Serious Co-op
Complete a co-op game on serious difficulty and extra enemy strength on 400%.
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