Complete the indicated task to unlock the achievement.

Achievement	How to unlock
Bringing Trolls to a Jotun fight	Bring at least one Troll to the Jotun fight.
Brother shall kill brother	Kill Knut.
Don't blame the messenger	Bring warbanner to Thora.
Enter Jotunheim	Go through the gate to Jotunheim.
Finally Valhalla	Become a mountain.
Go back to Jotunheim	Spare all Trolls.
He was big?	Kill a half jotun.
Homecoming	Go back to the farm as a kid.
Joined the darkside	Become a Jotun.
Noooo..	See your mother die.
Run from the Jotuns	Escape the cave.
You will live another day	Spare Knut.
Your life ends here Troll	Kill all Trolls.