You're asking for a great deal!
Honestly, I used to keep a running tab of credentials and professional organizations. One thing you're asking for is subjectivity (e.g., the credentials that "don't mean anything"). They all have a meaning, but I get what you're saying.
Validity of these credentials is in the eye of the beholder--please keep that in mind. Much of the time I've found that people don't honor credentials that they, personally, do not hold. That's a bad policy. My RCC, for instance, is rare for coders outside freestanding Rad practices to have; yet, it is by far the most stringent on acceptable CEUs, one of the more challenging exams, and so on.
My point here is that the list I've compiled was 10 pages or so long when I couldn't keep up any longer. I'd be happy to pass this along.