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