Here is the full list of all 11 I commissioned some bees 3 achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Completed the game in its entirety
Find everything hidden in the Mechanical Lizard artwork.
Find everything hidden in the Mind Bend artwork.
Find everything hidden in the Oceanside artwork.
Find everything hidden in the Costume Party artwork.
Find everything hidden in the Dinosaurs artwork.
Find everything hidden in the Kitchen artwork.
Find everything hidden in the Engine Room artwork.
Find everything hidden in the Pumpkin Garden artwork.
Find everything hidden in the Bears artwork.
Find everything hidden in the Space Bots artwork.