Europa Universalis IV
373 Achievements
200+h
GOG
Krabater
Form the nation of Croatia and station a unit of cavalry in Stockholm.
0.1%
How to unlock the Krabater achievement in Europa Universalis IV - Definitive Guide
This is very easy. As of 1.30, Croatia is a starting nation. Start the game as them, get access to Sweden's borders, and send a Cavalry unit to Stockholm. Can be done in less than 5 minutes.