Here is the full list of all 52 Cats Everywhere achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Find the special cat hidden in the kitchen.
Find the special cat hidden in the room.
Find the special cat hidden in the street.
Find All the Cats in the Street.
Find 200 cats in any place.
Find an object: There are suitcases somewhere.
Find 150 cats in any place.
Find another animal: There is a fish somewhere.
Find another animal: There's a frog somewhere.
Find an object: There is a fire hydrant somewhere.
Find another animal: There's a dog somewhere.
Find All the Cats in the Bedroom.
Find an object: There is a soccer ball somewhere.
Find an object: There are toy blocks somewhere.
Find 125 cats in any place.
Find an object: There is a teddy bear somewhere.
Find an object: There is a toy dinosaur somewhere.
Find an object: There is a cup somewhere.
Find an object: There is an old box somewhere.
Find an object: There is a basket of apples somewhere.
Find an object: There is a painting of flowers somewhere.
Find an object: There's a globe somewhere.
Find 100 cats in any place.
Find All the Cats in the Kitchen.
Find an object: There is a wall clock somewhere.
Find 75 cats in any place.
Find an object: There is a coffee maker somewhere.
Find 50 cats in any place.
Find All the Cats in the Living Room.
Find an object: There is a good book to be read somewhere.
Find 25 cats in any place.