User blog comment:Trellar/Achievements Unlocked/@comment-1997905-20111010202625/@comment-1997905-20111010224010

I think it would be interesting to see rollback undo achievements as well as edits - for example, say a user adds 200 gibberish categories to an article, then removes them. By rollbacking that, it would be nice to see any badges earned from those edits removed, as well as the counters reset to what they were prior to the edit. Similarly, it would be nice if the undo function could also revert achievements, as a user could add spam categories, then remove them while logged out or on another account, such that the edit that added the categories cannot be rollbacked. However, it's also conceivable that corrupt administrators who only care about achievements would use that ability to rollback essentially every edit by everyone, in an effort to remain number one on the leaderboard.