| Achievement | How to unlock
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| Air Element | Obtain the Air Element.
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| Are You Serious? | Complete the game in single player on unmodified serious difficulty.
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| Cannon Expert | Pierce at least 10 enemies with a single cannonball.
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| Co-op Beginner | Complete any level in co-op.
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| Co-op Hippy | Complete a level in co-op with blood option set to hippy.
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| Earth Element | Obtain the Earth Element.
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| Fire Element | Obtain the Fire Element.
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| Fragger | Frag a total of 100 players.
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| Hey! That's cheating! | Trigger Ugh-Zan's regeneration.
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| Huge Pile of Lava | Defeat the Lava Golem boss.
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| I love my Cannon | Kill 100 Enemies with the Cannon.
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| I love my Minigun | Kill 300 Enemies with the Minigun.
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| I love my Rocket Launcher | Kill 150 Enemies with the Rocket Launcher.
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| I love my Shotguns | Kill 250 Enemies with a shotgun.
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| I love my Thompson | Kill 200 Enemies with the Thompson Submachine gun.
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| Leap of Faith | Leap into the unknown on Luxor.
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| Look Ma, I won! | Win a versus match.
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| Look, it's a secret! | Find at least 10 secrets in single player.
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| Metropolis King | Complete the Metropolis level in single player on unmodified serious difficulty.
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| Quick Draw | Pull out a single Colt and immediately deliver a killing shot.
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| Serious Beginner | Complete any level in single player.
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| Serious Co-op | Complete the game in co-op on unmodified serious difficulty.
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| Serious Run | Complete the game in single player by beating the estimated time on each level.
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| Serious Sam | Complete the game.
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| Wall of Bullets | Kill 20 enemies with the Minigun without releasing the trigger.
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| Water Element | Obtain the Water Element.
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