Here is the full list of all 22 Doodle God achievements. It takes around 4-5 hours to unlock all of the achievements on Windows.
Greatest Inventions quest completed
Save the Princess quest passed
Run, Santa, run quest completed
Sins vs. Virtues quest completed
Survivor quest completed
6 elements created
10 groups created
Life created
Human created
Episode One passed
Episode Two passed
Episode Three passed
Episode Four passed
Games created
Episode One passed without hints
All Bad things created
Alle drankjes aangemaakt
Element created 3 or more times
Similar elements reacted
All episodes passed without hints
All reactions revealed
All reactions with Philosophers' stone discovered