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