Just wanted to put this out there, especially because I feel Shadowlands is probably going to shake things up quite a bit. Through Legion Archaeology you can obtain Key to Nar'thalas Academy. This item allows you and your party members to phase into the past version of Nar'thalas Academy and fight a mob. Doing so gives you the title Headmistress/Headmaster. There's no achievement, it's a kind of secret title, if you will. I can assist people on Alliance and Horde. It's character specific, so you have to do it on each toon you want it on.