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