Here is the full list of all 21 Rubber Ducky and the Rainbow Gun achievements.
Type the 2nd section of the dialog from the 6th level backwards into the cheat code selector! Don't forget to puncuate and capitalize properly!
Beat the dev's score on the last level! (You might want to shoot for around 1500)
Play with Death Epileptic Pixel mode on. (There's also a game of the same name)
Convince/bother/bribe the dev until everyone gets this achievement.
Unlock all the levels!
Everyone knows it's the best part!
Looks like someone just likes firing the Rainbow Gun. . .
. . . or it would have been, anyway!
Place fifty-jillion (100) plants in the bounce house at once.
Be addicted to social media.
Have the game run below 30 Frames Per Second.
Buy all the costumes!
I told you to go right, didn't I. . .?
It's there, it's unique! Just look closely!
Well, it's sorta' in the level. . .
It's a practical paradise, just for you!
This one's not too hard to find. . .
Well, it's still there. . . just less dire.
You're the best! :D
Get below 8:00 in speed run mode.
You've defeated the derpy brother and unlocked a message from the developer. . .