#fallen tower

Find the Fallen Tower Tavern, this is what it looks like:

There is a path that leads behind the tower that has orcs blocking it, but following it leads you up the tower and unto the roof. There is a large broken spiral staircase. Climb to the top of it and jump into the blue fire.

Once you get to the bottom, or sometimes while falling you will get the achievement. To get back out talk to the Archmage Ricven and he will take you out into the tavern.

Make sure your character is at full health, at lower levels the fall is enough to kill!