To my knowledge all titles come from achievements. So unless the quest you did unlocks an achievement which might give a title, there's no reason to assume you got one. And achievements do have rather visual splash window with sounds effect. What I'm saying is, you only need to check when you get an achievement, if it gave title or not. And the achievement window has the "latest 5" section so you don't even need to hunt for it all that much.

What they could do would be to add a small note of the received title to the splash window that now shows the achievement title and icon. Maybe a second line that tells the title received, or that there is item to pick up.