Full list of all 12 DeathSpank achievements worth 200 gamerscore. It takes around 10-12 hours to unlock all of the achievements on Xbox 360.
Reach Level 20
Kill Lord Von Prong
Discover all 30 Teleporting Outhouses
Finish 50 Side Quests
Kill 2500 Enemies
Destroy all 3 Queen Greems
Complete 6 Spelunker Quests
Kill Sergeant Orque
Drink 50 Potions
Dispense the Good, Vanquish the Evil
Kill 100 Chickens
Resurrect at an Outhouse