This bug has been around awhile, but is easy to fix. Hover over one of the recent achievements in the lower left corner of the client. Note that You do not see the names and descriptions of the achievements, but rather the names of what contains those bits of text. (See screenshot.)
I have been collecting these here: http://forums.poxnora.com/index.php...ng-desc-thread-and-other-missing-names.12441/ (post 10)
