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