Here is the full list of all 18 Hidden Cats In Town achievements. It takes around 1-2 hours to unlock all of the achievements on Windows.
Find all hidden cats in the town
Find all hidden cats without hints
Find 550 hidden cats in the town
Find 500 hidden cats in the town
Find 450 hidden cats in the town
Find 400 hidden cats in the town
Click on 400 balloons in the town
Click on 300 balloons in the town
Click on 200 balloons in the town
Find 350 hidden cats in the town
Find 300 hidden cats in the town
Find 250 hidden cats in the town
Click on 100 balloons in the town
Find 100 hidden cats in the town
Find 150 hidden cats in the town
Find 200 hidden cats in the town
Find 50 hidden cats in the town
Find 10 hidden cats in the town