| Achievement | How to unlock
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| Are You Serious!? (30 points) | Complete the game in single player on unmodified serious difficulty.
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| Bone Crusher (5 points) | Smash 20 Kleers with the Sledgehammer.
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| Chain Explosion (10 points) | Kill at least 5 headless kamikazes in one explosion.
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| Classic Outfit (10 points) | Find Sam's classic outfit.
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| Co-op Master (10 points) | Complete the campaign in cooperative with at least 2 players.
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| Get the hell off my ride! (10 points) | Secure the bird.
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| Headsman (10 points) | Decapitate a Khnum.
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| Killer Jewelry (5 points) | Kill an enemy using the Mutilator.
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| Kung-fu Fighter (10 points) | Perform all possible finishing moves in the game.
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| Load of Scrap (5 points) | Rip Scrapjack's head off.
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| Look, it's a secret (15 points) | Find at least 50 secrets in single player.
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| Maintenance time (5 points) | Blow a Major Biomechanoid into pieces.
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| Mission completed (10 points) | Power up the Timelock.
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| Problem solver (10 points) | Solve the riddle of the Sphynx.
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| Serious Beginner (5 points) | Complete any level in single player.
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| Serious Sam (20 points) | Complete the single player campaign.
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| The doorman should wear a suit (10 points) | Awake the Guardian of Time.
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| Trick Shot (5 points) | Kill the kicked enemy while it is still in the air.
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| Wall of Bullets (5 points) | Kill 20 enemies with the Minigun without releasing the trigger.
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| Wanted Dead or Alive (10 points) | Rescue professor Stein. So to say.
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