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