Battle for Azeroth Pathfinder, Part One

Battle for Azeroth Pathfinder, Part One is the first step in unlocking flying in BfA

Currently Rewarding Increased Mounted Speed in Kul Tiras and Zandalar

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Horde:
Reputation: Azerothian Diplomat

Story: Zandalar Forever!
- The Dark Heart of Nazmir
- Secrets in the Sands
- A Bargain of Blood
- The Final Seal
- The Throne of Zuldazar
including: Gonk, Lord of the Pack and Pa'ku, Master of Winds

War Footholds: Ready for War

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Alliance:
Reputation: [achievement=12946]

Story: Loremaster of Kul Tiras
- Drust Do It.
- Stormsong and Dance
- A Sound Plan

War Footholds: Ready for War

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Both Factions:
Exploration: Battle for Azeroth Explorer
- Explore Zuldazar
- Explore Vol'dun
- Explore Drustvar
- Explore Nazmir
- Explore Stormsong Valley
- Explore Tiragarde Sound

Remember, since it is a meta achievement, separate achievements can be earned on different characters, as long as it's on the same battle.net account.

Its 20% increased mount speed, you can check it with /run print(GetUnitSpeed("player") / 7 * 100); (it does not stack with the guild buff as maxser pointed out)