This is a simple tutorial explaining how to achieve the "Hey Good Looking" achievement.

1) Start up the mission "Fallen Angel".
2) Play through the mission until you are near the end of the car chase.
3) Drive out of the glass building.
4) Listen carefully until you hear somebody say that a "chain reaction" has begun.
5) When you hear this drive on the far right of the road until the explosion.
6) You will avoid the explosion and Harper will not be burned.
7) The achievement will pop up shortly after you have successfully completed the above steps.

Here is a video tutorial: