Slender: The Arrival

The forest fire section of The Arrival can be a real pain, with fires starting directly in your path, and sometimes even burning you without actually giving any visual cue that there is a fire in your way. The fires in the level toggle between two different layouts, once being easier than the other (featured in the video below). You can tell which layout you have based on whether you can turn right at the beginning (as I do in the video).

One important thing to note is that the trophy isn't awarded until the end game credits, so you won't know for sure if you succeeded until you finish the game.

I suggest playing on Easy, and taking it slowly. Slenderman won't pose much of a real threat, and you can take your time making sure not to run into any fire. See the video below for a successful run: