The Necrom Add-on for The Elder Scrolls Online has 4 achievements worth 170 gamerscore.
Complete quests, defeat bosses, and explore delves to become the Hero of Necrom.
Complete the main quest in Necrom.
Defeat Exarchanic Yaseyla, Archwizard Twelvane, and Ansuul the Tormentor in Sanity's Edge.
Reach level 50 as an Arcanist.