The Dark Heart of the Mogu

Thunder King: Vale of Eternal Blossom. Around the Mistfall Village on the map you can see a big gate. Go there, near the closed gate in the corner there will be the scroll.

Valley of the Emperors: Kunlai Summit. In the Valley of the Emperors try to find the Tomb of the Conquerors. Go down and in the middle of the room you will find the scroll, near the altar.

Spirit Binders: Jade Forest. Terrace of Thunders. On the map you could see around this area two legs of the broken statue. Go there and you will find that statue legs. The scroll is on the left side of this place.

The Lost Dynasty: Krasarang Wilds. On the map above the Ruins of Dojan text, you could see a water pool. Go there and when the elemental npc (Na Lek) is before you, then look left there is the scroll.

The Dark Heart of the Mogu

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• Spirit Binders - Jade Forest - 42,17
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• The Lost Dynasty - Krasarang Wilds - 50,31
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• The Thunder King - Vale of Eternal Blossoms - 40,77
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• Valley of Emperers - Kun-Lai Summit - 53,46
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• Note - Valley of Emperors is within a subzone. Above is the entrance, and within it it is at 58,71
• 
  

Full list of the others are available on the Lorewalker's comment section.

THIS ACHIEVEMENT:

/way Kun-Lai Summit 53 46 Valley of Emperors (58 71 inside)
/way Krasarang Wilds 51 32 The Lost Dynasty
/way The Jade Forest 42 17 Spirit Binders
/way Vale of Eternal 40 77 The Thunder King

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THE JADE FOREST:
/way The Jade Forest 36 30 The First Monks
/way The Jade Forest 47 45 The Emperor's Burden - Part 1
/way The Jade Forest 56 57 The Emperor's Burden - Part 3
/way The Jade Forest 42 17 Spirit Binders

/way The Jade Forest 26 28 Hozen Speech
/way The Jade Forest 63 88 Watersmithing
/way The Jade Forest 68 29 The Saurok
/way The Jade Forest 37 30 Xin Wu Yin the Broken Hearted

VALLEY OF THE FOUR WINDS:
/way Valley of the F 20 55 The Birthplace of Liu Lang
/way Valley of the F 55 47 A Most Famous Bill of Sale
/way Valley of the F 35 64 The Wandering Widow
/way Valley of the F 61 35 Waterspeakers
/way Valley of the F 83 21 Embracing the Passion

/way Valley of the F 19 32 Pandaren Fighting Tactics

THE VEILED STAIR:
/way The Veiled 55 16 The Defiant (Look at map: big round room vith water)

KRASARANG WILDS:
/way Krasarang Wilds 81 11 Quan Tou Kuo the Two Fisted
/way Krasarang Wilds 33 29 Last Stand
/way Krasarang Wilds 40 57 The Emperor's Burden - Part 4 (On first floor)
/way Krasarang Wilds 51 32 The Lost Dynasty

/way Krasarang Wilds 52 87 Hozen Maturity (Inside cave)
/way Krasarang Wilds 30 38 Origins
/way Krasarang Wilds 72 31 Waiting for the Turtle

KUN-LAI SUMMIT:
/way Kun-Lai Summit 74 84 Role Call
/way Kun-Lai Summit 44.72, 52.38 Ren Yun the Blind
/way Kun-Lai Summit 46 62 The Hozen Ravage
/way Kun-Lai Summit 68 48 The Emperor's Burden - Part 6
/way Kun-Lai Summit 41 42 The Emperor's Burden - Part 7

/way Kun-Lai Summit 63 41 Victory in Kun-Lai
/way Kun-Lai Summit 50 79 Yaungol Tactics
/way Kun-Lai Summit 72 63 Yaungoil
/way Kun-Lai Summit 44 51 The Emperor's Burden - Part 2
/way Kun-Lai Summit 53 46 Valley of Emperors (58 71 inside)

TOWNLONG STEPPES:
/way Townlong Steppes 65 50 Dominance
/way Townlong Steppes 84 73 Trapped in a Strange Land
/way Townlong Steppes 38 63 The Emperor's Burden Part 5

DREAD WASTES:
/way Dread Wastes 52 10 Amber (Enter South)
/way Dread Wastes 48 33 Cycle of the Mantid
/way Dread Wastes 60 55 Mantid Society
/way Dread Wastes 36 33 The Empress
/way Dread Wastes 67 61 The Deserters

VALE OF ETERNAL BLOSSOMS:
/way Vale of Eternal 26 21 Together, We Are Strong
/way Vale of Eternal 53 69 Always Remember
/way Vale of Eternal 68 44 The Emperor's Burden - Part 8
/way Vale of Eternal 40 77 The Thunder King