I hadn't paid that close attention to the new titles, but here's my opinion on the "50 Tyrian" missions.
The 50 is reference to the missions and bonuses being separate factors (25 missions, 25 bonuses). The way the missions were structured in the next two chapters was a bit different. Tyria was simple - either the bonus was completed or it wasn't. In Cantha and Elona, you could do the mission (Standard reward), the mission and part of the bonus (Expert reward), or the mission and the complete bonus (Masters reward).
Probably not the best explanation, but that's the way I see it. I bet they change the wording to 25/25 though (for the Tyrian missions). I really don't see them adding another 25 missions to Tyria though.
Mack
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