In order to unlock this Trophy you will need to successfully complete all 14 missions listed below on any difficulty. I knocked this out solo on Easy without any issues.
Prologue
-- The Horn of Magnus
Act 1
-- Smugglers Run
-- Supply and Demand
-- Black Powder
-- The Wizards Tower
Act 2
-- Engines of War
-- Man the Ramparts
-- Garden of Morr
-- Wheat and Chaff
Act 3
-- Waterfront
-- Well Watch
-- The Enemy Below
-- The White Rat
Epilogue
-- Waylaid
Good luck and happy Skaven hunting!!!