Here is the full list of all 39 Vikings - there are Wolves of Midgard achievements.
Complete the game as the Shieldmaiden.
Complete all Challenges on all maps.
Found all Legendary Items.
Unlock all Gifts in Skathi's gift tree.
Unlock all Gifts in Loki's gift tree.
Unlock all Gifts in Tyr's gift tree.
Unlock all Gifts in Odin's gift tree.
Complete all Trials.
Collect one of every rune.
Complete the game as the Warrior.
Complete Campaign 3.
All Hunt maps complete.
Rage continuously for over 20 seconds.
Unlock level 4 of the Shipmaster.
Unlock level 5 of the Smithy.
Become chieftain of all the clans.
Earn 1,000,000 Blood.
Unlock all Gifts in Thor's gift tree.
Kill 100 Jotun.
Complete the Imp Hunt.
Complete Campaign 2.
Burn the Imperial Fleet.
Killed 500 Tomte.
Earn 50,000 gold by selling resources.
Liberate Flotnar village.
Equip three runes on a single item.
Complete Campaign 1.
Keep Draupnir for yourself.
Travel to Utgard.
Survive the Mire-Witch's spell.
Complete any Hunt map.
Perform 1000 rolls.
Kill four foes in a single attack.
Defeat the Jokul.
Defend Ulfung Village.
Complete Game+.
Complete the game on the highest difficulty.
Accomplish campaign in Valhalla Mode
Accomplish campaign in Valhalla Mode on highest difficulty.