Here is the full list of all 30 Vlad the Impaler achievements.
Defeat Vlad as the Knight
Convince Vlad to stop
Enchant your weapon
Get to Vlad's Castle
Reach maximum good morality
Get the arm of the King of the Catacombs
Learn how traitors are treated in Istanbul
Defeat Vlad as the Assassin
Defeat Vlad as the Sorceror
Defeat Vlad as the Priest
Defeat Vlad as the Spy
Defeat Vlad as the Emissary
Kill Vlad with the Pole-Arm of Menace
Kill Vlad with the Primal Dirk
Kill Vlad with the Two handed Axe of the Oaken-Heart
Kill Vlad with the Dagger of Perpetual Stone
Kill Vlad with the White-Out
Kill Vlad with the The Bloodspark
Taunt Vlad
Die to Vlad
Get all of the weapons for the Mage
Get all of the weapons for the Soldier
Get all of the weapons for the Explorer
Reach maximum evil morality
Complete a quest in under 10 seconds
Have a skeleton give you a prophecy
Recieve a mysterious silver stake
Put the Red Harem out of their misery
Kill Vlad's Wife
Get all the achievements