Just found this out today. I hope this isn't repost, tried to search but didn't find anything..
In Isle of Conquest, you can use the catapult to launch you. When you do so, all fall damage is reduced. This way you can easily get the Going Down? and Drunken Stupor achievements. Just launch yourself high enough with the catapult.
I got it when I launched myself over the keep's wall.
Enjoy