Complete the following achievements to unlock Microsoft Gamerscore points.

Achievement	How to unlock
Firestarter (15 points)	Destroy all the Winter Shards and light all the fires in the Old Temple.
Legend-Marked (30 points)	Impress the Avvar of Stone-Bear Hold and gain their friendship.
Historian (30 points)	Uncover the secrets of a legendary figure.
Winter's End (90 points)	Dispel a myth of ancient days.