Here's the current list for the Solo tiers. I can't wiki-link all the individual MOBs right now, the forum server is having issues and already not letting me do it as a single post with just the zone links (and I didn't have the free time anyway). Also,
Laoch Chief Seti was added to Duo God.
Solo Master: 110 MOBs, must kill 25, from 8 different areas
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Western Wastes (5) : Yeldema , Myga , Sivar , Guardian Kozzalym , An ice burrower
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Skyshrine (8) : Laoch Uljux , Laoch Yubtin , Laoch Zalbryn , Elder Kalur , Elder Kajind , Elder Hajnix , Tri Velic , A Kromzek Spy
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Wakening Land (6) : Priest Grenk , Priest Delar , Priest Bjek , Mist Panther , Lady Gelistial , A corrupted faun
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Dragon Necropolis (12) : A Paebala Spirit Talker , An Entropy Serpent , A lava keeper , A Paebala Rebel , A Chetari darkling , A Chetari Master , A Chetari Dominator , A Chetari seeker , A Chetari dustshaper , A Chetari Deathshaper , A Chetari Warrior , A Dragon Construct
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Cobalt Scar (2) : Yvolcarn , A Bulthar Herdleader
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Siren's Grotto (3) : A siren priestess , An Enthralled Molkor , A Neriad Mistress
Great Divide /
Eastern Wastes] (4) : Vores the Hunter , Kardakor , Gnomish Deserter , Garath the Trader
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Plane of Mischief (15) : Brenn+Grenn
(A4 version, must kill back-to-back, all MOBs listed with a + sign count as 1 kill after all are killed) , TwentyTwo
(A4 version) , EightySix , A moldy sausage , Debbis the Fish , Stomples , Roxxanne , Ashley , Brittina , Diana , Pinky Ekkolofezznaboten III , A bishop thingy , A random piece , Another piece , Some other piece
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Plane of Growth (8) : A Feral Amalgam , Farstride Unicorn , A vigilant convoker , An entoling harvester , An entoling culler , A tranquil treant , A thifling orator , A bloodthorned spectre
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Velketor's Labyrinth (18) : Venar Icepaw , Ular Icepaw , Rowwek Icepaw , Marlek Icepaw , Laryk Icepaw , Kalik Icepaw , Errkak Icepaw , A crystal guardian , A Crystal Sentinel , A Crystal Gargoyle , Tijoely , Rijoely , The Brood Mother , The Brood Master , Meljemor , Leljemor , Keljemor , An icy watcher
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Kael Drakkel (29) : Adjutant Velsharek , Adjutant Thyek , Adjutant Strongaxe , Adjutant Stormkeeper , Adjutant Khellendor , Adjutant Jharll , Adjutant Hoggren , Adjutant Hekrandor , Adjutant Frinvan , Adjutant Frinevrn , Adjutant Droggren , Adjutant Derkan , Adjutant Daggeruk , Adjutant Cryyrn , Adjutant Brunkin , A cleric of Vallon Zek , Vealok the Angry , Noble Helssen , Bjrakor the Cold , A cleric of Tallon Zek , Veteran Yllhaydm , Veteran Surlren , Veteran Skeldek , Veteran Sjrelt , Veteran Mjrlind , Veteran Kltrem , Veteran Icecaller , Veteran Eiyloren , A visiting noble