Complete the indicated task to unlock the achievement.

Achievement	How to unlock
Beatnik	Complete any map other than Easy Street without any structure kills.
Big Spender	Spend more than $7,500 in any map other than Easy Street.
Bring Him Down!	Defeat the Juggernaut.
Circuit Breaker	Destroy fifty enemies using Tesla Coils in any single map other than Easy Street.
Clanked!	Defeat the Stalker.
Cloud Nine	Survive to wave 20 in Invasion mode on hard.
Cranked!	Destroy twenty enemies within one second.
Cryo Baby	Throw ten enemies at once with the Cryo Blaster secondary attack.
Defenders of Freedom	Reach level 20 with all player characters.
Earth's Protector	Complete every map on hard.
Fortified!	Complete all maps on insane.
Goose It!	Destroy an Annihilator before it deploys.
Great Balls of Fire	Set fire to ten enemies simultaneously.
Ice to Meet You	Freeze ten enemies within one second.
Ivy Leaguer	Complete a map other than Easy Street without the base taking damage.
National Icon	Reach level 20.
Negative Perspiration	Survive ten waves of Invasion Mode.
Reporting For Duty	Complete any map other than Easy Street using only infantry.
Sharpshooter	Destroy ten enemies with the Rifle in five seconds.
Slugger	Destroy five flying enemies in five seconds with the shotgun.
Square	Complete every map on normal difficulty.
Stacked	Unlock every structure and weapon.
They Shall Not Pass	Complete any map on hard, other than Easy Street without taking damage.