Full list of all 34 Chill Corner achievements. It takes around 20-25 hours to unlock all of the achievements in the base game on Windows.
The base game contains 25 achievements, and there are 2 DLC packs containing 9 achievements.
Unlock all stickers
Replying an email with a sticker
Sending an email
Petting your pet
Reading some letters
Decorate the room with at least one beetle tank
Decorate the room with at least one fish tank
Unlock 60 fish
Unlock 8 beetles