The current sequence follows:
1) Level 17
2) Complete Duskwoods
3) Ten Challenges in the Arena
4) Reach level 25
5) Craft Chestguard
6) Reach Level 45
7) Kill Professor

Getting the Chestguard Plans to drop is a pain. I finally defeated the horseman (twice), but never received the drop I needed. Still unable to defeat Plaguebearer. Not being able to guarantee a needed drop is a problem.

Anyway, the titles of Complete Golden Woods does not apply to reaching level 45. Also leveling Up does not match with Killing the Professor.