Here is the full list of all 9 Doodler achievements. It takes around 1-2 hours to unlock all of the achievements on Windows.
Finish all the elder levels
People don't think the universe be like it is, but it do
Finish all the adult levels
Finish all the teen levels
Jump three fity times
Die 50 times
Finish all the child levels
Actually open and play the game
Play on July 23rd