Board Thread:General Discussion/@comment-11100467-20140522045433/@comment-856287-20140522051503

Last I checked, you can't remove achievements unless you block the user: Help:Achievements
 * One of the contributors on my wikia is making bad edits and doesn't deserve to earn a badge for them. Can I take their badges away?
 * Once a badge is awarded, it can't be taken away. If someone is making silly edits just to get badges, then you can leave them a message on their talk page about it. As always, it's best to assume good faith -- they may not realize that they're doing anything wrong. Talking to them usually helps! If someone is vandalizing the wikia and fails to respond to messages, then blocking them from the wikia will remove their badges and take them off the leaderboard.

so… since NathanRW2 is blocked, his achievements are gone.