Where do the Act 5 Unique monsters spawn for the Special Assignment / Irreplaceable You achievements?
Here's the list, with some locations collected from http://www.d3andre.com/en/special-assignment-achievement-4.html. I haven't confirmed these locations myself but am making it community wiki so that will be easy to do. I'll put asterisks after locations that are confirmed in the table below.
- Lacocious the Diseased: The Plague Tunnels Level 1 **
- Morghum the Beast: Blood Marsh **
- Fangbite: Paths of the Drowned **
- Gozmol
- Vilepaw: Paths of the Drowned **
- Slinger: Paths of the Drowned **
- Tadardya: Paths of the Drowned **
- Vek Tabok: Passage to Corvus **
- Vek Marru: Passage to Corvus **
- Nak Sarugg: Ruins of Corvus **
- Nak Qujin: Ruins of Corvus **
- Bari Hattar: Ruins of Corvus **
- Lograth: Pandemonium Fortress Level 1 **
- Valtesk the Cruel: Pandemonium Fortress Level 1 **
- Scythys: Pandemonium Fortress Level 1 **
- Razael the Feared: Pandemonium Fortress Level 1
- Hyadures: Pandemonium Fortress Level 1 **
- Ballartrask the Defiler: Pandemonium Fortress Level 2 **
- Zorrus: Pandemonium Fortress Level 2 **
- Xaphane: Pandemonium Fortress Level 2 **
- Rockulus: Battlefields of Eternity **
- Obsidious: Battlefields of Eternity **
- Slarth the Tunneler: Battlefields of Eternity **
- Burrask the Tunneler: Battlefields of Eternity **
- Watareus: Battlefields of Eternity **
- Baethus: Battlefields of Eternity **
- Bloone: Realm of the Banished **
- Erdith: Briarthorn Cemetary **
- Hedros: Briarthorn Cemetary **
- Purah: Briarthorn Cemetary **
- Targerious: Briarthorn Cemetary **
- Yellow Ledbiter
- Gout Foot Johnson
- Dale Hawthorne: Westmarch Commons **
- Captain Gerber: Westmarch Commons **
- Igor Stalfos: Westmarch Commons **
- Yergacheph: Westmarch Commons **
- Jonathan Muddlemore
- Matanzas the Loathsome: Westmarch Commons **
- Maiden of Flame (x3): Westmarch Heights **
- Micheboar: Westmarch Heights **
- Theodosia Buhre: Westmarch Heights **
- Sumaryss the Damned: Westmarch Heights **
- Pan Fezbane: Westmarch Heights **
- Fearby the Prowler
- Phyneus the Growler: Westmarch Commons **