It would be very helpful to be able to export our achievement details to a text file similar to /export inventory preferably as an XML, ideally a website where we could review and plan our next quests to do. The achievement window is quite deep with lots of great information it would it be great to be able to massage the data externally.
Not sure what you are looking to line up, but Magelo premium syncs achievement completions. It won't show what has been done within each achievement, but can filter a list of what achievements are missing.