What am I missing for map completion?
Each borderlands counts differently. You need to finish red, blue and green. They all count separately for world completion.
Despite looking the same each borderlands has its own POIs, vista, skill points, ect. Each area has to be fully explored individually. Also there are some POIs and waypoints in the Hall of Memories. I don’t know for sure if those count for map completion but it couldn’t hurt to pop into the mists and grab those just incase. Other than that, the best you can do is use the Gw2 wiki and compare map zones to make sure you’ve got everything.
PvP maps don’t count. Hall of Monuments doesn’t either. But yes every borderland counts independently.
In PvE the most likely POI you missed is the Chantry of Secrets, the other ones are indeed the borderlands.