Here is the full list of all 13 DeathSpank: Thongs of Virtue achievements.
See all 20 of Madame Primp's Outfits
Discover all 44 Teleporting Outhouses
Watch Both Game Endings
Kill Santa Claus
Get an Engineering Degree
Go Sailing in a Pirate Ship
Learn to Speak Japanese
Kill 3000 Enemies
Kill Wortten
Reach Level 20
Kill the Taking Tree
Kill the Evil Nun
Convince an Orque Guard you are an Orque