I totally dig the idea of having uniformed "teachers" holding "zOMG!" classes. I don't have to much to suggest, seeing as most every concern I had has been addressed already. I especially give a nod towards the tiered achievements. That's a sweet idea.
If you need me to, I'd be more than happy to design certificates for certain achievements down the road.
If you need me to, I'd be more than happy to design certificates for certain achievements down the road.