We've datamined a new set of achievements in Midnight which award players who attain a region-best Mythic+ dungeon.
NEW Attain a region-best keystone dungeon completion for Algeth'ar Academy.
NEW Attain a region-best keystone dungeon completion for Magisters' Terrace (Midnight).
NEW Attain a region-best keystone dungeon completion for Maisara Caverns.
NEW Attain a region-best keystone dungeon completion for Nexus-Point Xenas.
NEW Attain a region-best keystone dungeon completion for Pit of Saron.
NEW Attain a region-best keystone dungeon completion for Seat of the Triumvirate.
NEW Attain a region-best keystone dungeon completion for Skyreach.
NEW Attain a region-best keystone dungeon completion for Windrunner Spire.
These achievements don't say "at the end of the Season", so it seems to imply that these work similar to the Mistwalker achievement back in Mists of Pandaria. These ones, however, are made for each dungeon.
