I've been going thru and completing old achievements. This achievement is tied to Fabled Freethinkers hideout. ive tried everything i can think of completing this from dying to fighting till the timer mechanic one shots the raid and killing him just before the mechanic that one shots the raid. Ans i've completed the task before hand even tried not completing it and not spawning him. Ive petitioned gms and they refuse to tell me how to do it. and knowing this achievement is from an 2007 expac am not sure anyone remebers it.