The Dragonborn Add-on for The Elder Scrolls V: Skyrim has 10 achievements worth 250 gamerscore.
Craft an item out of Stalhrim
Learn the secrets of 5 Black Books
Tame and ride 5 dragons
Own a house in Raven Rock
Learn all 3 words of Dragon Aspect
Discover 30 locations on the island of Solstheim
Complete "At the Summit of Apocrypha"
Complete "The Path of Knowledge"
Complete "The Temple of Miraak"
Arrive on Solstheim