The Dawnguard Add-on for The Elder Scrolls V: Skyrim has 10 achievements.
Defeat a Legendary Dragon
Acquire 11 werewolf perks
Use the special power of Auriel's Bow
Complete "Kindred Judgment"
Acquire 11 vampire perks
Learn all three words of Soul Tear
Complete "Beyond Death"
Complete "Awakening"
Complete "Lost to the Ages"
Change your face