Here is the full list of all 12 Laser Disco Defenders achievements.
Complete story mode with all characters
Complete story mode with Mr. Baker
Get to cave 21 in endless mode
Complete story mode with Tommy
Complete story mode with Donna
Get to cave 14 in endless mode
Complete story mode with Liz
Survive 8 caves without taking a hit
Pick up more than 10 hearts in one game
Complete a cave with more than 50 lasers in it
Take out 1978 enemies over the course of the game
Try out every outfit combination