So I started WOW again on a fresh account and when it comes to getting achievements about exploring zones, it appears that some zones like Dun Morogh and Teldrassil cannot be fully explored…
When it comes to Dun Morogh, we have :
Amberstill Ranch / Gol ’ Bolar Quarry / New Tinkertown / Gates of Ironforge and North Gate Outpost that remains gray so we can’t get the « Explore Dun Morogh » achievement.
For Teldrassil we have :
Rut’theran Village and Darnassus that remains gray and the problem is the same as above, impossible to get « Explore Teldrassil » achievement.
Elwynn forest, AzureMyst Isle are good but these two are not working.
Also important to mention that I am in the old version of Teldrassil / Darkshore after speaking with Zidormi.