Another place you can naturally earn this achievement is halfway through the quest The Path of Warriors in Skellige. Once you've completed the mountain climbing portion of the quest you're directed to go down to the cave entrance and are forced to slide down to it - if you aim Geralt properly and slide to the cave while avoiding obstacles you can earn this achievement. Handily, there is a fast travel point at the top of this hill (Yngvar's Fang)!