There's nothing particularly wrong with it, but I've always viewed such threads with a jaded eye. For one thing, it gives me an icky feeling when I see someone tooting their own horn, and for another I think most of these "I ranked up!" threads are a form of merit-phishing (and they usually succeed, too).
I agree 100% with this.
What I'm not so sure about the BitcoinGirl.Club initiative is that it will succeed. Some members may advertise their achievements in its thread, but I'm sure some others will not.
Let's see for example that on this very board we have a recent example of a thread about plagiarism:
Another account spotted for plagiarism!when there is a thread specifically for that created by LoyceV in meta.
I guess creating your own thread instead of putting the achievements or plagiarism reports in another centralized one, has to reap more merits, and somehow people know that. That's why I say that I doubt that the initiative will succeed.