Complete the indicated task to unlock the achievement.

Achievement	How to unlock
100 Kills (10)	Kill over 100 enemies in a single level.
1000 Kils (10)	Kill over 1000 enemies in a single level.
20 Level Mark (10)	First 20 levels completed.
2000 Kills (10)	Kill over 2000 enemies in a single level.
250 Kills (10)	Kill over 250 enemies in a single level.
500 Kills (10)	Kill over 500 enemies in a single level.
Big Gun Challenge (10)	Finish a level with only big guns.
Big Levels (10)	Finish one level of the extended campaign.
Campaign Completed (10)	Complete the campaign.
Content Creator (10)	Build a level with the level editor and finish the level.
Coop Player (10)	Finish one coop levels.
Engineer (10)	Upgrage 5 towers in a single level.
Experienced (10)	First 65 levels completed.
Extended Campaign Completed (10)	Complete the extended campaign.
First Level (10)	First level completed.
First Upgrade (10)	First tower upgraded.
Half Way (10)	First 45 levels completed.
Laser Challenge (10)	Finish a level with only lasers.
Making Progress (10)	First 10 levels completed.
Rocket Challenge (10)	Finish a level with only rocket launchers.
Splash Damage (10)	Kill 3 enemies with a single shot.
Splash Damage (10)	Kill 5 enemies with a single shot.
Tutorial Completed (10)	First 5 levels completed.