User blog comment:Kirkburn/Technical Update: January 27, 2015/@comment-1009971-20150129142940/@comment-126761-20150129160351

Unfortunately, so far we've not has any luck in restoring the original counts for the 'edit-a-day' achievement - the system was never designed with that in mind. :( At the moment, we're mostly focussing on what we can do to avoid this issue happening again in the future.