Stuntman: Ignition

You need to string the whole scene into one combo to get 5 stars. Easiest ways to keep a combo alive is by driving close to an object or by drifting.

I don't take credit for the video, but it can be really helpful when going for the achievement:

Timestamps for the video:
Scene 1 - Scud Run - 0:33
Scene 2 - Unsung Hero - 2:10
Scene 3 - Dogs of War - 3:54
Scene 4 - Ambushed Escort - 5:54
Scene 5 - Behind Enemy Lanes - 7:35
Scene 6 - Final Conflict - 9:35