Found this great solution by By NCSFan001 on PSNProfiles.
https://psnprofiles.com/guide/5042-homefront-the-revolution-...At the end of the second mission, "Alone in the Dark", you will have to escape the collapsing tunnel on a motorcycle. You are given exactly 60 seconds to escape, but for this trophy, you must escape in 50. The path is pretty much a straight line through the tunnels, so you shouldn't have many problems finding your way out. You need to go at the maximum speed for the entire ride and if you fall off or mess up, go ahead and restart, as the margin of error is about 2-3 seconds at most. If you miss this on your first playthrough, you will have to go for it again on another playthrough.