Sha of Hatred

If you are like me and needed him for the Tranquil Master title, yet hadnt quested much in townlong, then you need to go to the Gao-Ran Battlefront and get all the quests there,(if there arent any quests there follow along until you find the spot youre at) this is the bulk of the questing you will have to do so dont get discouraged it goes downhill. After that, you will travel to the bridge, (its the giant tree going across the Widening Deep) do those quests, then you will go to Rensai's Watchpost, youll have to do 3 or 4 quests before youre asked to go inside the mountain and kill The Sha of Hated, you cant get in the mountain without being on the quest, and the achievement is not completed until you hand the quest in.

hope this helped, <Player> the Tranquil Master

Lore information on the Sha for those of you who haven't been reading the quests :)

The Sha originated from the death of an Old God, Y'Shaarj (who is confirmed to be very very dead). In his dying breath he cursed Pandaria with this strange energy - but a pale shadow of his true self, the source of the Sha, and it lay dormant for thousands of years.
There are only six known 'main' sha, though there were seven heads of Y'Shaarj, and similarly the tale is known as the Seven Burdens of Shaohao. This may mean that there is another Sha somewhere.
This is not widely known knowledge, though the Klaxxi have shown they are aware of it.

When Shaohao, the Last Emperor of Pandaria, fought his own fears and doubts and bested each Sha (a temple situated at the sight of each battle) and buried the Sha beneath Pandaria, they began feeding off every harsh word, doubtful thought, hateful expression, waiting. This is why some Sha have greater control in different regions of Pandaria. The August Celestials knew the Sha would eventually be released, and that is why they train their monks in a certain style to deal with the specific Sha buried under their temple.

Sha of Anger - Defeated and buried at the sight of the Temple of the White Tiger located in Kun Lai.

[npc=59651] - Defeated and buried at the sight of Temple of the Red Crane located in the Krasarang Wilds.

[npc=56439] - Defeated and buried at the Temple of the Jade Serpent located in the Jade Forest.

Sha of Fear - Defeated and buried at the current sight of the Niuzao Temple located in the Townlong Steppes. This Sha also has corrupted the majority of the Mantid, including Grand Empress Shek'zeer.

Sha of Hatred - Defeated and buried at the sight of the Temple of the White Tiger located in Kun Lai.

Sha of Violence - Defeated and buried at the sight of the Temple of the White Tiger located in Kun Lai. At some point he is imprisoned by the Shado-Pan, he is eventually freed from his cage and defeated.

From Zero quests done to killing Sha of Hatred:
LVL 120 (Alliance)

-1) Behind the Battlefront
2) Unwelcome Intruders

3) Breach the defenses
-4) Trap Setting
5) Returning from the Pass
6) The Endless Swarm
-7) Treatment for the troops
-8) Back on Their Feet
-9) Rummaging through the remains
10) Improvised Ammunition
11) Cutting the Swarm
12) Terror of the Dread Wastes
13) Along the Southern Front
-14) Taking Stock
15) Enraged by Hatred
16) Joining the Fight

17) Up In Flames

18) The Taking of Dusklight Bridge
19) Joining the hunt
20) In Skilled Hands
21) Hostile Skies
22) Devastation Below
23) Heroes of the Shado-Pan
24) Buried Beneath

25) Taoshi and Korvexxis
26) Nurong and Rothek
27) Lao-Chin and Serevex
28) Sha of Hatred

I suggest doing this as a miner, as I got 214 Ghost Iron Ore, 55 Kyparite, 6 White Trillium Ore, and 5 Black Trillium Ore!