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.
All reactions with Philosophers' stone discovered
Episode Three passed
Episode Four passed
All Bad things created
Alle drankjes aangemaakt
All episodes passed without hints
Games created
Episode One passed without hints
Save the Princess quest passed
Sins vs. Virtues quest completed
Survivor quest completed
Episode Two passed
10 groups created
Life created
Human created
Episode One passed
Element created 3 or more times
Similar elements reacted
Run, Santa, run quest completed
6 elements created
Greatest Inventions quest completed
All reactions revealed