An Emberlight in the Dark - The Cheesey Mushy Way ~~

You think you need to actually get to emberlight to get the achievement? WRONG!
Simply start a party at D18 and mosey on down past the guardian knight to around where the starting elevator is (where you'd spawn if you had actually gotten to D18 from T2), once you get close it should award you with the achievement.
I discovered this by accident waiting for the gate to change. :3
~Mush

lol