Here is the full list of all 29 Please, Touch The Artwork 2 achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Find all paintbrushes
Find and pet the dog
Find all seagulls
Bring the masked man home
Find the masked villan
Find all matchsticks
Find all seashells
Find all vase pieces
Find all fruit
Find all ray babies
Find all easel parts
Find Jezus' crown
Play the piano and learn a famous song
Find all piano scores
Find all moustaches
Find all crosses
Find all drinks
Find all cats
Check out the first game via the menu
Spot all 8 differences
Find all bottles
Repaired a hole in a painting
Find all buckets