0 0 0For this achievement you are required to obtain the 6 skulls from Holdenfort & Caldberg on the second island. Must be collected during the sneaking section as they de-spawn once you start the battle for the city.
0 0 0When doing this achievement you must remember:You have to collect the skulls while you are sneaking in the forts. When you attack a fort with your army all the skulls are gone!There is a text guide for this located here http://www.xboxachievements.com/game/viking-battle-for-asgar... from xboxachievements, and here is a video if you don't like text guides: