Welcowme on board!
Launch the game for the first time!
The Man With the Martian Gun
Get the Zapper.
Spring Break
Survive spring!
Sunset Rider
Survive summer!
Winter is coming
Survive fall!
Like a Boss!
Repel the Martian threat for good!
Flawless Spring
Save all the cows on every Story level of spring.
Perfect Summer
Save all the cows on every Story level of summer.
Impeccable Fall
Save all the cows on every Story level of fall.
Spotless Winter
Save all the cows on every Story level of winter.
Save ALL the Cows!!
Save all the cows on every level of the Story mode.
"Beware Planet Earth!" Turbo Prime EX Plus Alpha
Save all the cows on every level of the Story mode in Veteran difficulty.
Challenge Accepted!
Save all the cows throughout all the Challenges.
Challenge Accepted... and Defeated!
Save all the cows throughout all the Challenges in Veteran difficulty.
The shield is down!
Save all the cows throughout the whole 'Weird Science' Challenge category.
Party time! Excellent!
Save all the cows throughout the whole 'Hard Rock from the Red Planet' Challenge category.
They're coming to get you, Barbra!
Save all the cows throughout the whole 'Zombies of Mars' Challenge category.
I MAID A GAM3 W1TH M4RT1ANS!!!1
Save all the cows throughout the whole 'Maid Raid' Challenge category.
Teenage Martian Ninja Troopers
Save all the cows throughout the whole 'Ninjas in the Snow' Challenge category.
The Old School Republic
Save all the cows throughout the whole 'Back to Basics' Challenge category.
Bomberman!
Blast at least 8 Martians with one Bomb!
Good Cogs Never Rust
Defeat a Winter Story level without letting one Cog disappear.
The Cow is a lie
Behold a Cow going through a quantum wormhole!
The butterfly effect
Successfully start a chain reaction using 4 or more Explosive Barrels!
When you have to shoot, shoot! Don't Talk!
Use the Zapper to finish a Martian.
GLaDOS is not gonna be glad!
Witness or cause the collapse of a quantum wormhole.
Chekhov's Raygun
Someone's gotta fire it before the end.
Trick or Treat!
Survive all five 'This is Halloween!' bonus levels!
Smashing Pumpkins!
Save all the cows on all the 'This is Halloween!' bonus levels.
Who you gonna call?
Save all the cows on all the 'This is Halloween!' bonus levels in Veteran difficulty.
Ain't that a cute little gun?
Survive all five 'Meet the Martians' bonus levels!
For science...you monster.
Save all the cows on all the 'Meet the Martians' bonus levels.
Martians can't count to three.
Save all the cows on all the 'Meet the Martians' bonus levels in Veteran difficulty.