Pinnacle of Storms

For those who want to know when the release dates are for the different difficulties/LFR wings:

"With the release of Patch 5.2: The Thunder King, the vast Throne of Thunder raid will become available. As in previous raid tiers, Raid Finder wings and availability difficulties will be staggered.

To access the new Raid Finder wings you will need a minimum average item level (ilevel) of 480.

This is our current schedule based on a planned patch release date of March 5. If the patch is delayed, or if we determine any change is needed, we’ll update this article.

March 5 – Normal Throne of Thunder
March 12 – Heroic Throne of Thunder and LFR Wing 1 “Last Stand of the Zandalari”
March 19 – LFR Wing 2 “Forgotten Depths”
April 2 – LFR Wing 3 “Halls of Flesh-Shaping”
April 16 – LFR Wing 4 “Pinnacle of Storms”"

Blue post here.

As of right now, the achievement is bugged and does not complete upon killing Lei Shen on normal.

This appears to be fixed.