Requirements to unlock Highmountain Taurens:- Have the Battle for Azeroth expansion pack purchased.
- Complete the achievement "Ain't No Mountain High Enough", which is awarded once you complete the main storyline in Highmountain. This should only take a few hours, and most people have already done this as part of their leveling from 100 to 110.
- Be exalted with the Highmountain Tribe. This takes a little while if you are completely new, and the best way to get reputation is by doing the following three things:
1) Complete all quests in the Highmountain zone.
2) Do World Quests in High Mountain.
3) Complete follower missions that award Highmountain Tribe Insignia. Alternatively do other reputation follower missions as well if you can get over 100 % success chance, since this will give you a chance of getting the Greater Highmountain Tribe Insignia. The first one gives 250 rep, while the greater one gives 1,500 rep, so it's often worth the gamle.
The Highmountain Tauren recruitment scenarioOnce you have completed the above requirements, head over to Orgrimmar to begin the recruitment quest. This will show you why and how the Highmountain Tribe wants to join the Horde, and this small quest chain should not take much longer than 20 minutes to finish.
Once you deliver the scenario quest you will be able to create new Highmountain Tauren characters, and your Horde characters will also get the Highmountain Thunderhoof mount.