Elusive Foes: Timeless Isle

Quick note about this achievement:

The rare "Ra'sha" is actually Gu'chi the Swarmbringer, once you kill this rare it will count towards the achievement.

Taken from mel9525's post that i found on Rock Moss comment section (and other similar rare) (give him a like)

Removed unnecessary rare mobs that aren't in this achievement and added information about the 3 other rare mobs.

In the Water:
/way 34.2 83.7 Karkanos
/way 61.0 88.6 Rattleskew
/way 47.2 88.0 Zesqua

On the Coast:
/way 25.0 36.0 Chelon (Seem to be on a timer of 40-60min according to it npc page, but so far, i've waited over 3 hours and i haven't see the interactable object)
/way 24.6 70.0 Furyshell 1
/way 21.0 42.2 Furyshell 2 Great Turtle FuryShell, like his name imply, is summoned after killing lots of Great Turtle mob around the coast.

Inland Mid-Western Area:
/way 44.0 70.0 Cranegnasher
/way 40.5 82.6 Gu'chi (Ra'Sha)
/way 37.6 77.6 Zhu-Gon
Emerald Gander Spawn location(2) is at the east(from what I've personally seen) of the Celestials' ground, where Crane mobs need to be killed for hope to be spawned.
Ironfur Steelhorn Spawn locations seem to be around the Celesitals' ground, where IronFun mobs need to be killed for hope to be spawned.

PS: It seem you need to kills Ironfur beast around the map for the Ironfur Steelhorn to appear, equivalent of the crane with Emerald Gander.

Red Stone Run:
/way 59.6 48.6 Spelurk

Cavern of Lost Spirits:
/way 46.6 32.8 Spirit of Jadefire

The Blazing Way:
/way 67.6 44.0 Leafmender

NPC that have no location on WoWHead(no coord with map):

Cah Silentsky

Not all of them but:
/way #554 45.0 38.4 Spirit of Jadefire
/way #554 43.8 69.6 Cranegnasher
/way #554 33.8 85.8 Karkanos
/way #554 41.6 72.2 Gu'chi the Swarmbringer
/way #554 67.6 44.2 Leafmender
/way #554 60.6 87.8 Rattleskew
/way #554 59.2 48.4 Spelurk
/way #554 25.2 36.0 Chelon
/way #554 37.8 77.2 Zhu-Gon the Sour
/way #554 47.0 87.4 Zesqua