1. The counts for the layer achievements are not updated - I have no idea how long they've been stuck, but it's definitely been months.
2. The achievements aren't awarding. I have 1300+ items on my head layer, for example, but the counter/achievement still says 945 / 1,000.

I found this thread about wardrobe layer achievements not updating and it's relevant, but I didn't want to necro it. I tried the workaround there with both the original and v3 wardrobe to no avail - looks like that was only possible via the beta wardrobe.