Get 100 perfect rounds.

Kill 2 enemies with a single Bomb.

Beat a wave with only skills and blocks.

Complete a level without using any skills.

Hit 10 enemies with Thunderbolt.

Kill a Walker with an Anti Air Tower.

Kill 10 enemies in a single Penentrator shot.

Have no blocks at the end of a level.

Complete one level.

Clear the Training Area.

Clear Brightholme Industries.

Clear the Facility Compound

Clear the Hydro Islands.

Kill a Huge Walker.

Unlock all tower and skill slots.

Kill a Big Walker.

Beat a level on Hard.

Beat all levels on Normal.

Kill the Patriarch.

Kill the Charger and all its clones.

Unlock all towers and skills.

Beat all levels on Hard.

Kill the golden Walker.

Get all stars in all levels on Hard difficulty.

Kill 10.000 Walkers.

Kill 10 enemies with a single shot

Clear Elysion