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Ahead of the Curve: The Jailer
Defeat The Jailer in the Sepulcher of the First Ones on Heroic difficulty or higher, before the release of the next raid tier.
Ahead of the Curve: The Jailer requires defeating The Jailer in the Sepulcher of the First Ones on Heroic difficulty or higher before the next raid tier releases.
Defeat The Jailer on Heroic
Enter the Sepulcher of the First Ones and defeat The Jailer on Heroic difficulty or higher. This achievement was removed as of Season 4, but the associated mount reward remains obtainable until Dragonflight.
Obtain the mount reward
Earn 
Almanac's Echo from defeating The Jailer, then turn it in for 
Fractal Cypher of the Carcinized Zerethsteed.