I don't think there's anything definitive; only a murky fuzzy cloud of indistinct ooze clusters. There are simply (and only) possibilities and potentials.
Joined February 2012
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Achievements
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Mongoose 3
Have at least three original repos where Ruby is the dominant language
Raven
Have at least one original repo where some form of shell script is the dominant language
Cub
Have at least one original jQuery or Prototype open source repo
Walrus
The walrus is no stranger to variety. Use at least 4 different languages throughout all your repos
Forked
Have a project valued enough to be forked by someone else
Charity
Fork and commit to someone's open source project in need
Mongoose
Have at least one original repo where Ruby is the dominant language