Sleep - Send the cat to sleep
After you created your cat just right click on it und chosse the moon symbol.


Food - Take food to the cat
Just right click on the cat and choose the fish symbol.


Love - Take love to the cat
Just right click the cat and click the heart symbol.


Cat - Create a cat
Right click the cat, click the ball like symbol left to the heart and then press edit cat. After you did that just press next on every question and you should get the achievement.

Adventure - The cat return from an adventure
This Achievement is pretty random. When your cat feels like it it will go on an adventure and return with an item. All of these items will grant you the hidden achievements and you can view them under collections through the star icon.

The Cat can only go on an adventure when all of the bars are at least half full, so it needs to be fed, rested and loved. The adventure can last from 30 minutes to an hour. When your cat is on an adventure you can hover over the bed with your mouse and it will display this:

New Achievements added through updates:

Quick mouse - You are a quick mouse
For this Achievement you have to play the "Follow Mouse" Mode and get a score of at least 100. You can find the minigame when you right click on the cat and than click on the star icon.


Stars
These four Achievements we're added in Version 0.3.5 and all revolve around stars.
How do you get stars? By increasing the meters so petting and feeding your cat and letting it sleep.

Stars - You have 50 stars



Good Stars - You have 150 stars



Cat Box - Buy the Cat Box



Cat Home - Buy the Cat Home



The Cat Box and Cat Home can both be bought with stars when interacting with the cat beed.


If you have problems with the game or achievements don't comment under this guide. I am not the developer and I can't help you. Comment under update sections of the game or wait until the dev releases a new update.
Thx for reading, hope the guide helped :3