So I just went through my "wardrobe" achievements and clicked on every single one I didn't have, to trigger 42 achievements I actually was supposed to have lol.

Is there a way to do this sort of thing without going through every single achievement to check what items you still need, just to see that you already have them? This is for wardrobe, plushies, foods, etc. Is there a page I maybe don't know about somewhere?

Are you trying to trigger layer achievements?

no, I was triggering the ones where you need a set of items in your wardrobe, like the rag dolls and Subeautique.

Achievements are and pretty much always have been peculiar. Dealing with the Achievement system is its own achievement. No, there's no one way to trigger them. For some going there and opening won't work. Even the method for recovering all your Achivements from the previous Achievement system with one click had problems.

My best advice is to ask around for any of them you might be having difficulty with, and see what others did.

No. Unfortunately the item achievements are almost all "triggered" achievements where you have to go to each one and open the list. Its a pain. Also, for me, when I'm opening many at once, they sometimes don't trigger, so you may have to go back over the ones you don't have and try again to see if you trigger any more.

On the other hand, congrats for all your achievements!