Heartbreaker — the FIRST part of pathfinder.
Dude, we are hosed.
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From MMO Champs:
The first part of the Legion Pathfinder achievement is in, granting increased mount speed: Broken Isles Pathfinder, Part One. It requires:
•Completing 100 World Quests
•Exploring the map of Broken Isles
•Completing the Legion quest story lines
•Completing your class hall campaign
•Earning Revered with six of the Broken Isles reputations