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