Verified
This is quite easy, click on the cat when launching the game.


On their way to the horizon
This achievement you should do ASAP. It requires you to click on balloons that appear when you get a new high score. You need to get 6 high scores to get 6 balloons. The easiest way of getting this is to deliberately get low scores at first and increase them slightly to get new high scores every time. Alternatively, if you have a score above 0 on all your 9 high score slots on all 3 games, a string appears in the top right corner of the scoreboard menu which you can click on to make balloons appear.

Ghost Cat
While playing Cat Breed Billiards, hit a ghost cat into one of the holes. Note, the ghost cat is quite rare and you might have to restart a few times to get it.

Wearing a mask
Same as the Ghost Cat, you need to knock a raccoon ball into a hole in. Note, the raccoon is quite rare and you might have to restart a few times to get it.

Cats With Owl Heads
Same as the last two, you need to knock an owl ball into a hole. Note, the owl is quite rare and you might have to restart a few times to get it.

Dreams
Click on the Sofa in the Menu, then click on the cat in the middle, then the butterfly in the first circle from the middle, then the red fish, then the red paw print.

Blub Blub
In Indoor Racing, you need to hit a water cooler with a fish inside of it. Note, the fish appears frequently, but it may take awhile to get it to spawn in the water cooler, so when it appears, you have to be alert to get it.

Debugging
There is a chance when entering games to get into a screen with a bug running across it. Catch the bug by leading it slightly and clicking. You have to do this 3 times. An easy way to get this is by entering a game, then exiting if the screen doesn't appear, rise and repeat until you catch 3.

QWERTY
Click on the computer in the Main Menu, and type in ENIGMEOW.


Schroedinger's Cat
Turn Advanced Cat Physics on in the Options menu.


猫
Click on the 中文 button in the Options menu.


Cat
Click on english in the Options menu.


Kopi Luwak
Turn Hot Coffee on in the Options menu and then click on the coffee mug on the table in the Main Menu.


Hardcore
Click on the Catfood For Gamers logo in the Main Menu.


Floating Cat
Go to the scoreboard from the Main Menu by clicking on the three cats on the podium, then click on the sleeping cat in the bottom left.

Birdwatching
Click on the window in the Main Menu, then catch the birds 9 times by leading them slightly and clicking.