| Trophy | How to unlock
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| - Defeat A Boss Alien Together With Flamethrowers.
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- He Shoots, He Scores (Bronze)
| - Score 1,000,000 Co-Op Points On A Level.
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- Locked And Loaded (Bronze)
| - Purchase All Weapons From The Shop.
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- Never Get It Back (Bronze)
| - Watch The Alien Breed Prologue.
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| - Kill 50 Aliens During A Countdown.
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| - Complete Alien Breed Level 2 Without Firing Your Weapon.
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| - Kill 2 Aliens With One Shot.
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| - Collect Every Pickup On A Level.
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| - Reach An Exit Deck Lift With 1 Second Remaining.
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| - Die Together In The Mashers On Convergence Level 4.
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| - Score 17,171,717 Points Total Single Or Co-Op Play.
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- There's No I In Team (Bronze)
| - Complete A Level In Co-Op.
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| - Complete Alien Breed Se Level 11 In Co-Op Without Tripping The Alarm.
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| - Defeat A Boss Without Firing The Assault Rifle.
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- You're Only Supposed To Blow The Bl**dy Doors Off (Bronze)
| - Complete A Level Using No Keys.
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