Wolfenburg is a large town and the capital of Ostland. It is located at the easternmost tip of the Middle Mountains, deep in the centre of the Empire. Refugees fleeing from the Raven Host have flooded into the town, looking for a safe haven behind its high walls.
To unlock the exploration achievement Wolfenburg, go to the area Wolfenburg in Ostland and approach an intersection with a wagon and some dead bodies on the ground. Coordinates are 43500, 60000.