At the end of Episode 4, you’ll need to jump a chasm to get to the Museum. Do this by driving the nearby tow truck to the edge of the gap and then get out. Press the switch on the driver’s side of the truck bed to raise the ramp and then shoot the two locks off the back of the truck to lower the last section. This triggers a cutscene showing a swarm of Vampirz coming to attack. Run back to your car, ignoring Sarah’s cries for help. This will trigger another cutscene showing her being taken away and Edward promising to come find her.
Get in your car, get up some decent speed, and then use the tow truck bed as a jumping ramp to fly across the chasm. The achievement will unlock when you land on the other side. If you don’t make the jump, don’t worry. Your game reloads after the last cutscene, so you can climb back in the car and try again.