Red skulls:Red skulls are only found in the fortresses during infiltration missions. Once the main assaults start they will disappear. Achievements:ACHIEVEMENT – HOW TO UNLOCKViking Conqueror Normal (30 points) – Beat the game on normal difficulty.Viking Conqueror Hard (60 points) – Beat the game on hard difficulty.Niflberg Supplies Freed (20 points) – Liberate the farm and the quarry in Niflberg.Dragon Summoner (15 points) – Find and charge the dragon gem Hugin and dragon amulet, and summon a dragon.Skullbagger 1 (15 points) – Collect the 6 skulls in Darkwater.Savior of Niflberg Normal (25 points) – Liberate Niflberg completely on the normal difficulty level.Savior of Niflberg Hard (35 points) – Liberate Niflberg completely on the hard difficulty level.Galcliff Supplies Freed (20 points) – Liberate the farm, still, lumber mill, and the quarry in Galcliff.Dragon Master (15 points) – Complete the second dragon gem, and summon a dragon.Skullbagger 2 (15 points) – Collect the 6 skulls in Holdenfort and the 6 skulls in Caldberg.Demon