Java Cat achievement

[Sweetenerera]

I got the cat achievement, but didn't get 3 cats at the same time. Which wasn't necessary apparently.
Here's the proof that I got it:

Then how do you get it? By just opening multple lucky blocks in one game and get 3x (or 2 if you choose the cat,wolf,snowgolem kit) the cat? and also getting different kinds of cats? cause i already thought that that was what you had to do