When you arrive at the Visitors Center at the end of Episode 1, you will be attacked by a T-Rex. When you get control, press down on the D-pad to control Jessica. When the T-Rex sticks his head around to your right, have Jessica move two screens to the left. Quickly press up on the D-pad to switch to Dad, then push the crate off onto the T-Rex.
As you make your escape from the Visitors Center, Jessica will get stuck hanging from a ledge. You can pick whatever dialogue option you want to get her down, but you need to tell her "Don't be stupid!" if you want to unlock another achievement:
After that, you'll get a cutscene for the end of the episode, and your achievement.