To unlock the Farewell Drift trophy in Days Gone, you will need to accumulate a total of 10 minutes of drifting on your motorbike.
You can, of course, do this naturally as you play by pressing
+
+
in the direction you wish to turn.
If you want to do this in one go and get it out of the way with, you can perform a donut and keep spinning in a circle with your front wheel locked in place.
You can find a video showing a good spot and the method needed below (credit to PowerPyx on YouTube):