Taming a donkey gives me the "A Complete Catalogue" achievement (Tame all (10) cat variants)

First time trying to tame a horse / donkey on new snapshot. Not sure wheather this is a one-time incident.. So, I walked up to a random donkey and clicked to tame it. After a couple of attempts the hearts showed and I got the message that I had completed an achievement. I went on to check the Achievement tab, and it had been updated.