Here is the full list of all 13 Lab Rags achievements.
Beat level 4
Beat level 3
Create a sphere body
Create a bouncy body
Beat level 2
Beat level 1
Beat a level without leaving any bodies behind.
Create a cube body
Die for the first time.
To infinity and beyond!
Beat a level using only a single body
Beat every level without jumping
Beat every level without shooting (right-click by default)