Togonn Windmane’s encounters is missing the reset mote, forcing players to do the whole instance over and over every time the achievement is lost, which happens fairly often due to his habit of popping Sand Vortexes right under the player even when they are clocked by Second Shadow and well far from any Earth Elemental dying.
SUGGEST-A-TRON says:
PAY—ONCE—UNLOCKS—ARE—ALWAYS—BETTER.
No exceptions!