For anyone looking for an easy way to tick off this achievement...
I used Minsk. By the time he is rescued in Act 3, my party was already level 12. I simply leveled him up with one level in each class and the achievement popped.
"He that can smile at death, as we know him. Who can flourish in the midst of diseases that kill off whole peoples. Oh! If such a one was to come from God, and not the Devil, what a force for good might he not be in this old world of ours."
-Bram Stoker, Dracula
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