Viking: Battle for Asgard/Collectibles

Niflberg Mead

 * 1) There is one on the beach right next to Brighthelm. It is located to the east, next to the rightmost beached longboat, on the eastern side (right when facing the beach from Brighthelm).

Niflberg: Darkwater
There are six skulls to be found here to get the achievement.

Galcliff: Holdenfort
There are six skulls to be found here, however the twelve on the island are required for the achievement.

Galcliff: Caldberg
There are six skulls to be found here, however the twelve on the island are required for the achievement.

Isaholm: Thornvik
There are four skulls to be found here.