basically I don't know how the map info is stored but. It would be a plugin that tells you. If you have completely a map for atlas bonus.
If a map in your stash has elder or shaper influence.
I guess you would have to open your atlas before the plugin to refresh and know if you completely it but what do you think?
So when you hover over maps in your inv you can tell which ones are shaper/elder infleunced/ which you need to do to complete the whole atlas.