For a comprehensive guide, see my Not A Walkthrough
TM list. It walks you through the entire game, including story-related and collectible achievements.
Part 1:
Blair Witch Not A Walkthrough - Part 1 - Beginning to Truck Fuse PuzzlePart 2:
Blair Witch Not A Walkthrough - Part 2 - Truck Fuse Puzzle to Rail TrackPart 3:
Blair Witch Not A Walkthrough - Part 3 - Rail Track to Third CampsitePart 4:
Blair Witch Not A Walkthrough - Part 4 - Third Campsite to FinaleTake His Face is the default ending to the game. There is another ending, but it has very specific requirements that you almost certainly will not perform on a typical play. Essentially, the first time you finish the game, you'll get this.