First - Disclaimer: I have not looked through the list because I'm certain there are a handful of people who are knowledgeable enough in this area to save me the time of doing so.
Referring to the ones that are get/do/whatever X number of things (not spending emblems and the like), I recall seeing a lot of primes. I suspect it's meaningless and fringes on unintentional as simply another way to be unique as a game. Or is there a LOST-like conspiracy underlying it all?
Air it out.