Taylor on 13/11/2020 at 10:58

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I don't think you had to complete any optional objective.
There's at least 2 if not 3 missions before meeting the Master Builder. If I recall properly it happens right at the start of one of the missions.

This is what I remember, but this series really impressed me so this should be more or less accurate:
It happens right after the mission, where you go to the Netherworld and as you come back Garrett realises he died in the process (a fact they didn't tell him before sending him down to the Netherworld). The mission ends as Garrett goes into the cemetery of the Haunted Cathedral just to find his own grave, realising he turned to an undead in the meantime, and next you're in front of the Builder who tasks you with a new quest (if I recall well, in exchange for sending you back to the living, if you succeed)