Start the game or a chapter in Duo mode and this trohy will be yours! One player has to play as Jodie and the other as Aiden.
You can also do this alone with a second controller.
Edit: Enisha90 confirmed that this can also be done with a smartphone as the second controller.
Edit 2: lazyNeighbour confirmed that this is also possible with a PS2 controller (if you have an usb connector for it)
Edit 3_: caayn_ commented: This can also be done with a PS4 controller. Just hook it up via USB, or pair it via bluetooth (share+PS button), and you're ready to go.