Ok so it's a pain in the ass, but hopefully this can help
Note: These suggestions are combined from numerous sources, wowhead, other forum areas etc
From the Exploits section:
If a hunter tames one of the rare spawns for this achievement(such as Nuramoc), you can duel them and kill the pet and get the achievement also anyone in the group gets it aswell.
From Wowhead:
All-in-one targeting macro (255 chars):
Code:
/tar Fulgor
/tar Mekt
/tar Vorak
/tar Martic
/tar Bog Lurk
/tar Coilfang Em
/tar Crip
/tar Doomsay
/tar Okrek
/tar Goretoo
/tar Voidhunt
/tar Morc
/tar Hema
/tar Speak
/tar Nura
/tar Ever-Core
/tar Chief Engineer L
/tar Collid
/tar Kraat
/tar Ambassador J
Rares by zone:
Hellfire Pennisula
Fulgorge - 62 Rare Chest Burster. Can spawn in any location with regular Chest Bursters.
Mekthorg the Wild - 61 Rare Orc. Spawns in any Orc Camp (Zethgor or along the Longitude of of Hellfire Citadel).
Vorakem Doomspeaker <Herald of Doom Lord Kazzak> - 62 Rare Demon. Spawns amongst other Demons (Legion Front, Forge Camps, and Pools of Aggonar).
Zangarmarsh
Marticar - 63 Rare Fen Strider. Patrols the West Coast out past Sporeggar, the Northern Edge above Coilfang, or the NE edge just outside the Dead Mire.
Bog Lurker - 63 Rare Bog Giant. Spawns amongst the broken one tribes. S of Cenarion Refuge, S of the Twin Spires, or West of Orebor.
Coilfang Emmisary - 63 Rare Naga. Spawns amongst the 4 Naga camps in Zangarmarsh.
Terokkar
Crippler - 65 Rare Skeleton. Spawns in and around the undead of Auchindoun proper in the Bone Wastes.
Doomslayer Jurim - 64 Rare Draenei. Patrols the roads South and West of Shattrath (as far as the road into Shadowmoon Valley), though he can cross paths with and be killed by patrolling Shattrath Guards.
Okrek - 64 Rare Arakkoa. Spawns in any of the 4 Arakkoa camps throughout Terokkar (exludes the camp SW of the Bone Wastes, apparently)
Nagrand
Goretooth - 65 Rare Crocolisk. Any of the major lakes of Nagrand (Aka, SE of the Zone, S of Throne of Elements, Around Nagrand, or by Sunspring Village)
Voidhunter Yar - 68 Rare Void Monstosity. Spawns around Oshu'gun.
Blade's Edge Mountains
Morcrush - 68 Rare Crystal Giant. Spawns in the area surrounding, and North of, Death's Door.
Hemathion - 68 Rare Dragon. Spawns out in the Western Edge of the zone.
Speaker Mar'grom - 68 Rare OgreMagi. Spawns within Ogre camps.
Netherstorm
Nuramoc - 70 Rare Chimera. Can spawn Southern Edge of Area 52's Island, Northern Ridge above Manaforge Duro, or the Western Ridge of the Stormspire Island.
Ever-Core the Punisher - 68 Rare Arcane Construct. Patrols any of the Mana Forges B'naar, Ultris, or Ara.
Chief Engineer Lorthander - 69 Rare Blood Elf. Patrols Mana Forges Ara, B'naar, and Coruu.
Shadowmoon
Collidus the Warp-Watcher - 68 Rare Beholder. Patrols the SE world edge, NE world edge, or just South of the the Deathforge.
Kraator - 68 Rare Infernal. Legion Hold's Foothills, Eclipsion Fields, North of Coilskar, or North of the Warden's Cage.
Ambassador Jerrikar <Servant of Illidan - 69 Rare Satyr. Spawns in any of the areas under Illidan's control (Illidari Point, Eclipsion Point, Coilskar Point, N of the Warden Cage, or the Orc camp S of the Black Temple)
Note that this one has been excluded from the Achievement, probably due to error.
Bro'Gaz the Clanless - 66 Rare Ogre(?). Spawns along the North-South road in Western Nagrand, the roads just north of Telaar, or SW of Telaar near Kil'Sorrow Fortress.
Link to maps:
NPCs - World of Warcraft
p.s.
Macro for germans:
Code:
/tar okrek
/tar bots
/tar sumpfla
/tar abg
/tar col
/tar verk
/tar verdammnisverkünder j
/tar gier
/tar grimm
/tar hem
/tar kraa
/tar martig
/tar mekt
/tar mord
/tar nura
/tar sprecher mar
/tar leerj
/tar vorakem
/tar stein