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.
Opet at least 1 chest
Hit oponent with power of 7 or more
Find at least 1 secret place
Get 50.000 gold
Win 25 battles
Reach the 10th level
Find and open all chests
Collect 40 cards
Explore 25 locations
Win at least 1 arena
Be chanpion in all arenas
Hit opponent with power of 15 or more
Find all secret places