No missable achievements (plus 33 unknown)
Sign in with Steam or Xbox to track your progress, and:
Launch the game for the first time!
Get the Zapper.
Use the Zapper to finish a Martian.
Survive spring!
Save all the cows on every Story level of spring.
Survive summer!
Witness or cause the collapse of a quantum wormhole.
Blast at least 8 Martians with one Bomb!
Behold a Cow going through a quantum wormhole!
Save all the cows on every Story level of summer.
Survive fall!
Defeat a Winter Story level without letting one Cog disappear.
Someone's gotta fire it before the end.
Repel the Martian threat for good!
Save all the cows on every Story level of fall.
Survive all five 'This is Halloween!' bonus levels!
Save all the cows on all the 'This is Halloween!' bonus levels.
Save all the cows on every Story level of winter.
Save all the cows throughout the whole 'Zombies of Mars' Challenge category.
Save all the cows on every level of the Story mode.
Survive all five 'Meet the Martians' bonus levels!
Save all the cows on all the 'Meet the Martians' bonus levels.
Save all the cows throughout the whole 'Weird Science' Challenge category.
Save all the cows throughout the whole 'Hard Rock from the Red Planet' Challenge category.
Successfully start a chain reaction using 4 or more Explosive Barrels!
Save all the cows throughout the whole 'Back to Basics' Challenge category.
Save all the cows throughout the whole 'Ninjas in the Snow' Challenge category.
Save all the cows on all the 'This is Halloween!' bonus levels in Veteran difficulty.
Save all the cows throughout the whole 'Maid Raid' Challenge category.
Save all the cows throughout all the Challenges.
Save all the cows on every level of the Story mode in Veteran difficulty.
Save all the cows on all the 'Meet the Martians' bonus levels in Veteran difficulty.
Save all the cows throughout all the Challenges in Veteran difficulty.