Getting your 'Master of' badge has nothing to do with your level or the quest you are given at level 48.
The 'Master of' badge is earned when you have learned every spell in your main school of focus. This means all the spells from your Professor, earned through quests, and from secret trainers throughout the Spiral.
I checked the list, i have all the spells, from mb, from kt, from Mildred in collosus, i counted and i have all of them i need. I still dont have the badge, is there more to it? I am going to run a double check right now...
