This Seeking Tech guide will explain how you can get the Sky Turtle trophy.
To unlock this, you need to do the following: “As Bentley, climb to the roof of Rajan’s Palace in Episode 2: A Starry Eyed Encounter.”
Use the following video as a reference:
For the first step, make sure you purchase the Hover Pack, which will be available on the ThiefNet in Episode 6.
After buying the gadget, equip it to Bentley and then use it to climb the palace in Episode 2 to unlock this trophy.