I simply sunk the jar and it didn't work, you could see the jar, and this was like this before. i killed the lich and he spawned and the jar was in the water.
simply sinking it won't work.
- You have to teleport on top of the jar while it is floating in the water, then teleport onto land again. Vaatikitten 20:16, August 10, 2010 (UTC)
Oh, i got it now thanks. Should say that on the achievement description here