I have 121 non-CW items in my wardrobe and I still don't have the achievement. I have tried opening the wardrobe and viewing them, which works for most wardrobe achievements, but it isn't/hasn't been working for "Get off my back". Is there something I can do to make it work or is is some sort of bug?

I got it to work! I put on all the back items and then tried to save my HA, it gave me the achievement when I refreshed the page. I've never had to wear all the items to get the achievement before.