A client wanted to be able to add some descriptive text for certain achievements. For example, when Alice Brown earns "grand poobah" the admin goes in to the admin UI, selects this achievement, adds "For doing a fancy maypole dance" and clicks Update. Then on the leaderboard you see Alice along with the description.

I created this code in a separate module, but I'd be happy to provide this to the community in the form of a patch. Any interest?