Bronze: "Clan Leader" -- Gain 3 Subscribers
Silver: "Important Person" -- Gain 12 Subscribers
Gold: "Leader of the People" -- Gain 50 Subscribers
Bronze: "The Creep" -- Subscribe to 3 People, Debates, or Topics
Silver: "The Watcher" -- Subscribe to 12 People, Debates, or Topics
Gold: "The Super-Spy" -- Subscribe to 50 People, Debates, or Topics
Bronze: "The Meddler" -- Instigate 3 Debates
Silver: "The Revolutionist" -- Instigate 10 Debates
Gold: "The Professional Instigator" -- Instigate 50 Debates
Bronze: "The Triggered Passerby" -- Contend 3 Debates
Silver: "The Maddened Critic" -- Contend 10 Debates
Gold: "The Professional Contender" -- Contend 50 Debates
FYI, those last two assume Contender and Instigator refer not which position you take on a matter, but whether or not you were the one who created the debate. Maybe we could even have one or something that goes the other way. Also, it would be interesting to know if there is a way to tell if a debate was set to be against a specific person (as compared to becoming an open challenge). Is that information recorded somewhere? And this thread leads me to think of this here...
Bronze: "The Helper" -- Give 1 Used Recommendations to the Site
Silver: "The Assistant" -- Give 3 Used Recommendations to the Site
Gold: "The Developer" -- Give 7 Used Recommendations to the Site
Also, you might want to sort the medals somewhat. Like by "Debates, Forum, Miscellaneous, and Meta."
Without that medal suggestion above, there would still be a use for all four of those categories, and you could brag that you're the first to complete "all of the forum ones," if that's what you think matters, in case you just aren't interested in those meta ones (such as reading the site's release notes).
P.S., in the list of current medals, don't you think "Law Abiding Citizen" should be "Law-Abiding Citizen"?
Also, there were a few other ideas I've thought of, but I haven't finished fully yet. It can be slightly hard to thing of the perfect names for things and such.