The Hand of Merlin
54 Achievements
GOG
A Hero's Journey
Bring your warband to rank 10, while in Normal mode or harder.
3.4%
How to unlock the A Hero's Journey achievement in The Hand of Merlin - Definitive Guide
If you take the longest route through each area then you might be able to pick this up - it will be luck based though as you need to get enough reknown. If you struggle to get it this way then don't worry too much, I usually got to level 9 max in most runs. There is an easier way to get it, when you have unlocked Hard Mode+ you can use one of the blessings to start with an extra 50 reknown. This should be enough to push you over to level 10.