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