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