Hmm, I don’t think I can help you much because I mostly have noninformation.
I have five of them, out of seven, but I only remember what two are for, and I never actually tried to get any of them. They didn’t interest me.
If I’m not mistaken, one or two are obsolete, by which I mean it’s no longer possible to attain them. I believe one refers to a thread that has been closed and archived for a long time. So that at least tells you not to bother about that one.