The fix for the pistol silencer seems to be working, but that still puts me at 13/15 weapon attachments. Does somebody have a list of all 15 of them?

The only answer I can think of, and I haven't tried this myself yet, is that you have to actually attach them to every possible weapon as well to get to 15, and it's possible that I've never used the silencer and pistol laser sight on the Hammer. Does anyone know if that's it? This is driving me nuts.