Progress on this achievement is shared account wide.
Obtain 20 of the cats listed below.
Title Reward: <Name> the Crazy Cat Lady/<Name> the Crazy Cat Man
You need only 20 cats from 24 listed, so TCG is optional
Correct. 19 of these Cats are currently available through normal means, and 4 of them are TCG/Promo/Store only. However, 1 new Cat (Aspect of Xuen) is being added in 5.4, so once you get him after Patch 5.4 is Live, you can have exactly 20 Cats without any TCG/Promo/Store pets.
I'm so excited for this achievement. 21 of the cats already obtained. I'm ready!
Hopefully, they change/remove Nightsaber Cub, from the achievement, before v5.4 goes live, as TCGs are not available for everyone..