| Achievement | How to unlock
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- "Beware Planet Earth!" Turbo Prime EX Plus Alpha
| - Save all the cows on every level of the Story mode in Veteran difficulty.
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- Ain't that a cute little gun?
| - Survive all five 'Meet the Martians' bonus levels!
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| - Blast at least 8 Martians with one Bomb!
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| - Save all the cows throughout all the Challenges.
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- Challenge Accepted... and Defeated!
| - Save all the cows throughout all the Challenges in Veteran difficulty.
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| - Someone's gotta fire it before the end.
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| - Save all the cows on every Story level of spring.
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- For science...you monster.
| - Save all the cows on all the 'Meet the Martians' bonus levels.
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- GLaDOS is not gonna be glad!
| - Witness or cause the collapse of a quantum wormhole.
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| - Defeat a Winter Story level without letting one Cog disappear.
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- I MAID A GAM3 W1TH M4RT1ANS!!!1
| - Save all the cows throughout the whole 'Maid Raid' Challenge category.
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| - Save all the cows on every Story level of fall.
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| - Repel the Martian threat for good!
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- Martians can't count to three.
| - Save all the cows on all the 'Meet the Martians' bonus levels in Veteran difficulty.
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| - Save all the cows throughout the whole 'Hard Rock from the Red Planet' Challenge category.
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| - Save all the cows on every Story level of summer.
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| - Save all the cows on every level of the Story mode.
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| - Save all the cows on all the 'This is Halloween!' bonus levels.
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| - Save all the cows on every Story level of winter.
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- Teenage Martian Ninja Troopers
| - Save all the cows throughout the whole 'Ninjas in the Snow' Challenge category.
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| - Successfully start a chain reaction using 4 or more Explosive Barrels!
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| - Behold a Cow going through a quantum wormhole!
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- The Man With the Martian Gun
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| - Save all the cows throughout the whole 'Back to Basics' Challenge category.
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| - Save all the cows throughout the whole 'Weird Science' Challenge category.
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- They're coming to get you, Barbra!
| - Save all the cows throughout the whole 'Zombies of Mars' Challenge category.
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| - Survive all five 'This is Halloween!' bonus levels!
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| - Launch the game for the first time!
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- When you have to shoot, shoot! Don't Talk!
| - Use the Zapper to finish a Martian.
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| - Save all the cows on all the 'This is Halloween!' bonus levels in Veteran difficulty.
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