GRID
38 Achievements
1,315
200-300h
Show Off
Won a race by crossing the line backwards
15
2.0%
How to unlock the Show Off achievement in GRID - Definitive Guide
Keep track of the finish line and on the last turn or section before the finish line on your last lap quickly flip around and floor it. Achievement pops during one of the post race screens.
*Edit
I finally got it. The Hammerhead' Career Event works for me. Every normal Race or Event not.
I got the trophy on my first attempt, using rewind when I first saw the finish line confetti to go back fifty or so metres to best time the the hand brake - turn moment.
Seems a lot less finicky than solutions suggesting putting the car in reverse gear.
Give it a try. I use a controller not wheel.
This one sounds trickier than it actually is as it can be done quite easily given that you can use a qualifying lap to start from first place on the grid. You will want to have a good race and obtain a lead of above 5 seconds at least. When approaching the finish line quickly do a 180 and floor it in reverse over the line. Remember you can rewind time up to five times if you mess up. This can be done across varying vehicle classes but picking a quicker one may make it easier for you. By switching the difficulty to very easy you gain the ability to have unlimited rewinds which can be put to use if you're struggling with this trophy.