So my pet Tranquilized apparently won the pet spotlight once with a previous owner. I only found this out when I went to check if any of my pets were checked for the pet spotlight and I got the achievement for her previous win, despite having never entered it myself. This doesn't really seem fair that I get an achievement for something I didn't do when others are working their butts off to win it or is that just me?

If you really feel it is unfair make a ticket and say so to staff that is what I would do

Pets can only win spotlight once, even if they change owners. I'm not sure that's how the achievement is supposed to work but you do technically own a spotlight winning pet.

I've just done so, thanks for the advice.

Well yeah but still, doesn't seem very fair to me. But that's just me, not sure about other people.