I think they are very much underutilized in games. A lot of developers seems to simply add achievements for reaching various milestones (how developer-like :P)

I think they are very much underutilized in games. A lot of developers seems to simply add achievements for reaching various milestones (how developer-like :P) -- but they could be used for so much more! What kinds of edge cases came up in testing that would be fun for the player? What kind of super secrets can you rally your playerbase to find/hunt down? What kind of silly little tasks can you come up with?