Here is the full list of all 12 Rolling Rumble achievements.
Fire 100 shots
Get one kill
Get 100 kills
Fire 1,000 Shots
Fire 10,000 Shots
Get 500 kills
Get 1,500 kills
Die 150 Times
Collect 1 powerup
Collect 50 powerups
Collect 250 powerups
Fire 100,000 Shots