I'm pretty sure I shouldn't have all those achievements for 5.000+ items in my wardrobe - I don't think I have so many wearables in there.

Also, found some items in my inventory that randomly appeared like ... I'm a bit lost.

Those are the achievement prizes.

I see, thank you. But a bit unsure what to do with the whole situation :(

Maybe you do have that many wearables, you just didnt realize it :3

I'd say double check that you don't have that many wears, and then file a ticket.

I have 3 pages when I set it to 500, yet I got the achievements up to 9 000.

OTZ oh gosh, here you are getting non - existient acheivments (sorry i dont know how to word it better) and Im here trying to figure how why i DIDNT get certain acheivments gosh XD

Well, as (Thank you so much for your help) suggested, I filed a ticket so it'll be gone soon, probably :). Maybe do the same to recieve yours?