I've definitely got some of the plushies from the Mooner Achievement in my collection, however it's saying I don't, even with hard refreshes/different browsers. I've noticed it with a couple of other sets too but can't recall them.

Edit: This is also showing up and I don't think I have received the Plush King Plushie either (can't find it in my vault or plushie collection) and only just surpassed 2500 in the last day or so.

It triggered the trophies, but nothing else, even after going back to the collection page unfortunately

Edit: After multiple refreshes on the Achievements page it seems like everything is in order again :)

Yeah the cache is sometimes a bit behind. Glad it worked out!!!