Here is the full list of all 13 Northmark: Hour of the Wolf achievements. It takes around 6-8 hours to unlock all of the achievements on Windows.
Be chanpion in all arenas
Collect 40 cards
Get 50.000 gold
Find and open all chests
Win at least 1 arena
Win 25 battles
Find all secret places
Explore 25 locations
Reach the 10th level
Hit opponent with power of 15 or more
Hit oponent with power of 7 or more
Find at least 1 secret place
Opet at least 1 chest