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Ahead of the Curve or, AotC for short, is an account-wide achievement which can be unlocked if you manage to defeat the last boss of the current raid tier on Heroic or higher difficulty. Is you can guess, a raid season's AotC achievement become unavailable when this season ends, so you will have limited time to unlock it.
With the release of Season 4, Ahead of the Curve: The Jailer can no longer be unlocked, but you can still get the Zereth Overseer mount as well a bunch of other Season 4 rewards:
HOW DOES IT WORK?
Piloted (only EU realms):
Selfplay: