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