Here is the full list of all 16 I commissioned some cats 9 achievements.
Complete the game in its entirety.
Find everything hidden in the Over The Motorway artwork.
Find everything hidden in the Overstocked Toy Store artwork.
Find everything hidden in the Animal Treasure Adventure artwork.
Find everything hidden in the A Tulip For A Mermaid artwork.
Find everything hidden in the Mystical Swamp Hunting artwork.
Find everything hidden in the Spacecraft Maintenance artwork.
Find everything hidden in the Flower Lab Cleanup artwork.
Find everything hidden in the Anchor Underwater artwork.
Find everything hidden in the Multiplayer Racing artwork.
Find everything hidden in the Cat Bridges artwork.
Find everything hidden in the Ocean In An Umbrella artwork.
Find everything hidden in the Butterfly Junkyard artwork.
Find everything hidden in the Sunny Cottage Knitting artwork.
Find everything hidden in the Mech Town artwork.
Find everything hidden in the Quiet Grassy Town artwork.