I hate to bring op WoW, but I like how you couldn't bluff your way into groups because of achievements. 1 too many times I've wasted valuable game time on groups who didn't even read up on basic battle mechanics but never bothered to mention they are new to the dungeon...

Maybe work in like an aura or something where you can see what the character has accomplished on terms of crafting/gathering/endgame stuff?

This could also be implemented in DF or PF, to balance groups instead of only using ilvl to filter out people...