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