I've found and saved a series of maps that have different locations mapped out from different people's ideas and interpretations, as well as different versions of maps of the Old World. (Link here if you're interested:
https://www.dropbox.com/sh/akx9intxkuo5 ... 2kqva?dl=0) I'm using them to try to figure out locations for every Quest or Quest Pack and have a few so far, though I don't have a proper map to place them on. Some are invented locations based on ideas I've taken from other people, but still near to named locations in the Warhammer world. I intend to fill this in more as I discover more locations.
My locations so far:
Capital City - Altdorf
Mentor's Tower - just south outside of Nuln, overlooking the city
The Trial - Catacombs of Karev, south of Nuln
The Rescue of Sir Ragnar - dungeons under Knightskeep near Castle Drakenhof
Lair of the Orc Warlord - stronghold near Zhufbar on the shores of Black Water Lake
Mellar's Maze - near Karak Norn in the Grey Mountains
Prince Magnus' Gold - a hideout south of Kroppenleben in the foothills of the Black Mountains
Legacy of the Orc Warlord - near Ulag's old stronghold close to Black Water
The Lost Wizard - a secret lab in the catacombs under Altdorf
The Fire Mage - beneath Black Fire Crag, a small canyon passage section of Black Fire Pass
Race Against Time - Mound of Krell?
Castle of Mystery - ?
Bastion of Chaos - ?
Barak Tor: Barrow of the Witch Lord - Barak- Tor?
Quest for the Spirit Blade - ?
Return to Barak- Tor - Barak Tor?
Kellar's Keep - Karak-Varn, near Black Fire Pass
Return of the Witch Lord -
Kalos, an underground keep under the ruined city of MorgheimThe Plague of Zombies - ?
The Halls of Durrag-Dol - south of Karak-Kadrin in the World's End Mountains near the source of the River Stir
Inn of Chaos - Inn in Zherdenschlosse, to the west of Durrag-Dol and east of Waldenhof
The Eyes of Chaos - ?
Revenge of the Weather-Man - Keep of the Windmaker?
Running the Gauntlet - across the Sea of Claws?
Against the Ogre Horde - ?
Elf Quest - Mage of the Mirror - ?
The Tower of the High Mage - Tarak Mountains?
Crypt of the Necromancer - crypt in a graveyard swamp beyond the Shuddering Forests?
Eyrie of the Storm Master - Dark Mountains?
Lair of the Orc Shaman - outside the Great Gate of Karak Varn in the foothills of the World's Edge Mountains
The Final Conflict - Zargon/Morcar's Citadel of Darkness?
Barbarian Quest - The Frozen Horror - ?
Advanced Quest: The Dark Company - sewers under the old section of Altdorf
A Growl of Thunder - ?
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EDIT - Moved here for future updates:
viewtopic.php?f=143&t=3552&start=50#p89626