A Screwball Scramble is an achievement that requires the player to use the advanced cliffside scramble shortcut while navigating through the Arandar Pass.
Head out the eastern entrance of Prifddinas and follow the path until one comes to a fork in the road. Some Agility shortcut icons appear on the minimap; follow the path south until the third shortcut icon is found. Use the shortcut and the achievement will be completed.