Seems to work fine according to the addon comments at www.esoui.com. As you draw the map it should show you the bosses etc. if you come near, so i could help you with that account wide stuff.
Btw. even with account wide achievements the bosses and harrowstorms and dolmens show unknown for me if I get near to them. Only as long as you have not visited them "near" once they will stay white (visited) as far as I noticed.