I've taken the time to map out all of the non-solo MOBs. Click on the zones and sort by upper level range to browse through them, it takes too much time to link each individually.
A lot of this will require either a Monk puller (most everything in ToV) or Enchanters having extra charm pets pre-parked. It's imperative to make sure there's no wrong info on the wiki about MOB stats, be sure to point that out for any of these you're intimate with, in addition to discussing which tier a MOB should go in.
Duo God/Trio Master: 52 MOBs, must kill 20, from 9 different areas
Western Wastes (9) : Von , Karkona , Derasinal , Draazak , Cargalia , Rak Sapara , Zil Sapara , Del Sapara , Tranala
Skyshrine (4) : A Huge Golem Sentry , A Huge Gargoyle Guard , Placlis , The Seer
Wakening Land (1) : Rolandal
Dragon Necropolis (3) : Queen Raltaas , Vaniki , Neb
Siren's Grotto (4): Priestess Sercema , Mistress Latazura , Helsia Mindreaver , Elna Kelpweaver
Great Divide (1): Taskmaster Abyott
Icewell Keep (1) : Seneschal Aldikar (Icewell Keep)
Plane of Growth (3) : Keeper of the glades , Undogo Digolo , Ancient Totem
Kael Drakkel (4) : Ymik , Weyen Stonetrader , Bendad the Trader , A Guardian of Zek
Temple of Veeshan (20) : Theldek the Stinger , Arreken Skyward , A cerulean sky gazer , An ancient frost guardian , An ancient guardian wurm , A burning guardian , A cerulean guardian , An elder crimson drake , an emerald watcher , A glimmering emerald drake , A greater sky drake , A greater malevolent drake , A malevolent drake , A raging wyvern , A vehement wyvern , An elder onyx drake , An elder racnar , Mazrien , Hsrek , Arreken Skyward
Sleeper's Tomb (2) :
An ancient sentry (must have linked aggro, post Sleeper awakening, no flurry) ,
A tireless servitor (must have linked aggro)
Trio God: 47 MOBs, must kill 15, from 4 different areas. Trio Legend title = 25 from this tier plus 30 from Trio Master tier
Western Wastes (3) : Mav Sapara , Jen Sapara , Mraaka
Plane of Growth (3) : Prince Thirneg , Guardian of Tunare , Guardian of Tunare (each of the two counts)
Kael Drakkel (8) : Dlammaz Stormslayer , Vkjen Thunderslayer , Velden Dragonbane , Sentinel Othkel , Sentinel Dragonbane , Sentinel Demek , Klraggek the Slayer , Irrek Bloodfist
Temple of Veeshan (33) : An ancient tigerclaw racnar , A tigerclaw racnar , A racnar (Temple of Veeshan) , A fiery guardian , A shimmer drake , Ymmeln , Tavekalem , Midayor , Krigara , Grozzmel , Essedera , Casalen , Meldikor the Windchaser , Zed`Renzicd , Yendilor the Cerulean Wing , Velcra`Dron , Sarek`Relan , Rlinf`Tae , Nir`Tan , Lurian , Kedrak , Kal`Vunar , Gra`Vloren , Dktan`Nirsl , Degta`Glis , Carx`Vean , Bryrym , Wel`Wnas , Nelaarn the Ebon Claw , Belijor the Emerald Eye , Ajorek the Crimson Fang , Malteor Flamecaller , Zemm
Group God Mode (Six Players): 21 MOBs, amount needed for title to be determined
Kael Drakkel (1) : Derakor the Vindicator
Velketor's Labyrinth (1) : Lord Doljonijiarnimorinar
Western Wastes (1) : Harla Dar
Temple of Veeshan (15): Lepethida , Vukuz , Beldion Icewind , Zyerek Onyxblood , Yrrindor Emerald Claw , Vyldin Flamereaver , Quellod Earthspirit , Kalkar of the Maelstrom , Cyndor Lightningfang , An Onyx Defender , An Emerald Defender , A Sky Defender , A Lava Defender , Zlexak , Sevalak
Sleeper's Tomb (3) : The Progenitor , The Final Arbiter , Master of the Guard