Complete the indicated task to unlock the achievement.

Achievement	How to unlock
Big bang	Destroy 8 enemies in 1 shot from a grenade launcher.
Dominator	Destroy 10 enemies in one use of the Dominator.
Dragon	Kill the third Boss.
Fire Golem	Kill the second Boss.
First Boss	Kill the first Boss.
Grenade launcher	Make 30 shots from a grenade launcher.