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