The Orsinium Add-on for The Elder Scrolls Online: Tamriel Unlimited has 6 achievements worth 220 gamerscore.
Complete quests, defeat bosses, and explore delves to become the Hero of Wrothgar.
Complete 27 quests in Wrothgar.
Complete Wrothgar's main quests.
Conquer all challengers and earn the title of Maelstrom Arena Champion.
Collect all 20 relics for the House of Orsimer Glories.
Conquer all challengers in Veteran Maelstrom Arena.