Fortified achievements

Completed any map on hard, other than Easy Street without taking damage

Survived 10 waves of Invasion Mode

Destroyed 10 enemies with the Rifle in 5 seconds

Reached level 20

Unlocked every structure and weapon

Completed any map other than Easy Street without any structure kills

Defeated the Stalker

Set fire to 10 enemies simultaneously

Completed every map on normal difficulty

Destroyed 5 flying enemies in 5 seconds with the shotgun

Destroyed 50 enemies using Tesla Coils in any single map other than Easy Street

Defeated the Juggernaut