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