For a comprehensive guide, see my Not A Walkthrough
TM list. It walks you through the entire game, including other 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 FinaleTotems are the little stick figures that hang from trees and lie on stones. Destroying 10 of these through any combination of playthroughs will unlock this achievement.
BE AWARE! Destroying totems almost certainly will ruin an attempt at this achievement, so be sure to break your totems on a separate run: