Here is the full list of all 40 My Coloring Book: Professions achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Color the Gardener according to example.
Color the Banker according to example.
Color the Engineer according to example.
Color the Journalist according to example.
Color the Worker according to example.
Color the Doctor according to example.
Color the Cook according to example.
Color the Office Employee according to example.
Color the Farmer according to example.
Color the Firefighter according to example.
Color the Athlete according to example.
Color the Fisherman according to example.
Color the Barber according to example.
Color the Policeman according to example.
Color the Biologist according to example.
Color the Writer according to example.
Color the Graphic Designer according to example.
Color the Golfer according to example.
Color the Musician according to example.
Color the Judge according to example.
Color the Nurse according to example.
Color the Photographer according to example.
Color the Painter according to example.
Color the Programmer according to example.
Color the Repairer according to example.
Color the Politician according to example.
Color the Reporter according to example.
Color the Seamstress according to example.
Color the Mechanic according to example.
Color the Chemical Designer according to example.
Color the Taxi Driver according to example.
Color the Repairman according to example.
Color the Tailor according to example.
Color the Waiter according to example.
Color the Fireman according to example.
Color the Weightlifter according to example.
Color the Artist according to example.
Color the Archer according to example.
Color the Chef according to example.
Color the Builder according to example.