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