At the start of Episode 2, you'll be tasked with finding a memento. The pile Teddy brought in will have none, but Amanda will be playing with a baseball. She'll only relinquish it if you shove her.
This scene has a stunt to watch out for, and that's the final one of an outstretched hand grabbing the ball. If you fail this stunt, David will fly out of the window and lose all his life, game over.
For this achievement, you only need to complete the scene.