Tazavesh Gearglider

Before starting the dungeon, activate hard mode using the neck item. This is required to unlock the 'Fake It 'Til You Make It' achievement and the mount reward.

Defeat all 8 bosses in Tazavesh, the Veiled Market on hard mode. A stealth class can run from the portal room to the oasis to skip roughly seven trash packs, as long as the portals are reachable from the entrance.

During So'leah's second phase, she gains 99% damage reduction and requires the group to resolve a clearing mechanic — a full group of 5 players is needed to properly execute it, so bring four others or be prepared for an extended fight.

For the Mailroom Mayhem encounter, have your healer switch to a DPS spec, use flasks and Heroism, ignore soaks and bombs, and burn the boss down before the first bomb explodes.

Upon completing the achievement, the Tazavesh Gearglider is guaranteed to drop for every player in the group, as the mega-dungeon mount system now awards it to all eligible members rather than just one.