Vale of Eternal Blossoms

If you're on a high pop realm, the easiest way to complete this achievment, is to complete Golden Lotus and Looking For Group: Vale of Eternal Blossoms.

Getting Exalted with The Golden Lotus takes two sets of dailies, that are accessible in the Setting Sun Garrison part of Vale of the Eternal Blossoms, which translates to roughly 30 minutes of play time.

Clearing Terrace of the Endless Spring on normal will take you around 15 minutes. It's incredibly easy. For heroics, you can just queue for them. Right now, with the scaling I would suggest doing these heroics at around 30-60 level mark.

Getting Exalted with The August Celestials for The August Celestials is just too time consuming, and killing three rares for Elusive Foes: Vale of Eternal Blossoms is also very difficult due to competition, especially if you're playing on a high pop realm. I was camping the area for quite some time, and never saw a rare up.

Notable rewards for the [event=1496] event:

Mount form Time Trial Achievement:
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[item=220766]

Toys from Infinite Power XII Achievement:
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[item=217723]
[item=217724]
[item=217725]
[item=217726]

Items from Zone Achievement:
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Townlong Steppes = [item=221817]
The Jade Forest = [item=220777]
Valley of the Four Winds = [item=221816]
Krasarang Wilds = [item=210334]
Kun-Lai Summit = [item=218247]/ [item=218248]
Dread Wastes = [item=220765]
Vale of Eternal Blossoms = [item=220768]
Landfall = Appearance: Class Ensemble
Isle of Thunder = Appearance: Class Arsenal

30+ New Mounts for [currency=2778]:
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Guide Link

Completed Elusive Foes: Vale of Eternal Blossoms and Golden Lotus in 30 mins.
Just fly around the vale and kill all rares. They give about 4k experience each.

Some rares don't count towards Elusive Foes: Vale of Eternal Blossoms, but just keep flying around and killing whatever has spawned.