Here is the full list of all 25 Super Rad Raygun achievements.
Watched the credits
Popped 99 Luftballoons in Berlin
Carrying 10,000 bits
Maxed out every powerup
Defeated Mad Donna in Washington DC
Watch a fox in PWS for 15 seconds after he's been saved
Killed a civilian mishyen!
Collected 40 batteries
Listened to the entire world map song
Finished the game
Killed 10 enemies in a row with the arc cannon.Killed 10 enemies in a row with the arc cannon
Got hit by a hammer projectile
Earned a 3-UP in Bonus Chance
Fell in the NYC train gap
Finished the game without buying any upgrades
Finished Managua without shooting any civilians
Ran right off the NYC train
More than 7 oil monsters onscreen at once
Saved 20 animals in Prince W. Sound
Killed an enemy with a ricochet bullet
More than 20 sprites onscreen at once
Touched Herr Metal while he's running away in Berlin
Reached the checkpoint without using the moving beam in Gdansk
Cashed in your convention token for a free battery!
Touched a white snake in the grass