So she looks at me and says, “You ever done any cliff-jumping? This is the best spot in all of Wrothgar.” I look down the 50 metre drop and say, “Ladies first.”
This journal entry explains where to obtain the Wrothgar Cliff Jumping Achievement in the Orsinium DLC.
Wrothgar Cliff Jumper Achievement
In the southeastern part of Wrothgar, in the Frostbreak Ridge region, Glothum the cliff jumper can be found over looking a cliff next to a high waterfall.
In order to get the achievement, the jump needs to occur on the right side of Glothum.