Quote Originally Posted by Felis View Post
Isn't the quest required to get the title?
Nope! You get the "Z" title when you get your Zeta (the quest before "The Vital Title")

The quest required for buying the replica was an extra, unnecessary quest that appeared AFTER you obtained your zeta. I know in my case, and many others', if you had more than one job to 50 he always had a red quest marker, so I didn't notice he had a new quest related to the Zeta. It didn't do anything except unlock an extra achievement, as far as I can tell.