Here is the full list of all 9 Misfire achievements.
Discovered the joy of painting
Inverted the controls of your opponents
Not what it sounds like
Spam that fire button cause you got infinite ammo baby!
Discovered the thrill of having a tank full of rocket fuel strapped to your back
Did the bare minimum
Bought something to swag out your spaceboi
Earned 1000 coins
Got the shield powerup for the first time