Here is the full list of all 53 Purrfectly Hidden Cats - there are Kittenbay achievements.
Open all the umbrellas. (Night)
Pet all pink cats. (Night)
Open all garage doors. (Night)
Illuminate the darkened lights.. (Night)
Check all cat flaps. (Night)
Read all posters. (Night)
Knock all barrels. (Night)
Find the alien and the duck.
Search all trash bins. (Night)
Open all curtains. (Night)
Ring all doorbells. (Night)
Pet all dogs. (Night)
Check all the newspaper stands. (Night)
Open all boxes. (Night)
Solve the puzzle. (Day)
Finish Kittenbay. (Day)
Pet all pink cats. (Day)
Pet all cats. (Day)
Pet all green cats. (Day)
Open all curtains (Day)
Close all the umbrellas. (Day)
Open all boxes. (Day)
Search all trash bins. (Day)
Watch all birds (Day)
Knock all hydrants. (Day)
Pet all dogs (Day).
Knock all barrels. (Day)
Check all the newspaper stands. (Day)
Read all posters. (Day)
Find Botticelli (Day).
Open all garage doors. (Day)
Open all backpacks & bags. (Day)
Find robot & duck. (Day)
Check all cat flaps. (Day)
Talk to all humans. (Day)
Ring all doorbells. (Day)
Read all flyers. (Day)
Listen to the radio. (Day)
Check all big plant pots. (Day)
Unlock all daytime achievements.
Find all creatures of the night. (Night)
Find Botticelli (Night).
Talk to all humans. (Night)
Read all flyers. (Night)
Check all plant pots. (Night)
Knock all hydrants. (Night)
Pet all green cats. (Night)
Solve the music puzzle. (Night)
Pet all cats. (Night)
Beat Startail's Challenge.
Finish Kittenbay. (Night)
Unlock all nighttime achievements.
Unlock all the achievements.