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 FinaleHere are all of the times I interacted with Jess.
*Answered her call in the car - SHAME FOR TALKING WHILE DRIVING
*After the fence, Jess texts and I call her back.
*Bullet takes me through tall grass. Jess calls soon after.
*After I fix the truck battery, Jess texts and I call her back.
*After I found Lanning, I called Jess. (This needs to happen quickly before you get to the dry stream.)
*After the battle, while I'm on the rail tracks, I called Jess.
*After I ride the rails and the bridge collapses, Jess calls.
*After I get to the sawmill and get reception, I called Jess.
***IMPORTANT: After you've gone through the fog, after the stag sequence, there's a VERY small window where you get reception. Call Jess. You'll leave a voicemail.
*Note: During the Twisted Maze, you'll get a bad call from Jess. Don't worry.
This will pop after a cutscene during the transition to the 4th campsite.