Beware Planet Earth

Challenge Accepted... and Defeated!

Save all the cows throughout all the Challenges in Veteran difficulty.

Martians can't count to three.

Save all the cows on all the 'Meet the Martians' bonus levels in Veteran difficulty.

Challenge Accepted!

Save all the cows throughout all the Challenges.

"Beware Planet Earth!" Turbo Prime EX Plus Alpha

Save all the cows on every level of the Story mode in Veteran difficulty.

Who you gonna call?

Save all the cows on all the 'This is Halloween!' bonus levels in Veteran difficulty.

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.

The butterfly effect

Successfully start a chain reaction using 4 or more Explosive Barrels!

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.

For science...you monster.

Save all the cows on all the 'Meet the Martians' bonus levels.

They're coming to get you, Barbra!

Save all the cows throughout the whole 'Zombies of Mars' Challenge category.

Ain't that a cute little gun?

Survive all five 'Meet the Martians' bonus levels!

Save ALL the Cows!!

Save all the cows on every level of the Story mode.

Smashing Pumpkins!

Save all the cows on all the 'This is Halloween!' bonus levels.

Spotless Winter

Save all the cows on every Story level of winter.

Trick or Treat!

Survive all five 'This is Halloween!' bonus levels!

Impeccable Fall

Save all the cows on every Story level of fall.

Like a Boss!

Repel the Martian threat for good!

Chekhov's Raygun

Someone's gotta fire it before the end.

Good Cogs Never Rust 

Defeat a Winter Story level without letting one Cog disappear.

Winter is coming

Survive fall!

Perfect Summer

Save all the cows on every Story level of summer.

The Cow is a lie

Behold a Cow going through a quantum wormhole!

Bomberman!

Blast at least 8 Martians with one Bomb!

GLaDOS is not gonna be glad!

Witness or cause the collapse of a quantum wormhole.

Sunset Rider

Survive summer!

Flawless Spring

Save all the cows on every Story level of spring.

Spring Break

Survive spring!

When you have to shoot, shoot! Don't Talk!

Use the Zapper to finish a Martian.

The Man With the Martian Gun

Get the Zapper.

Welcowme on board!

Launch the game for the first time!