Here is the full list of all 25 Blair Witch achievements.
Score 40 points in Cobra.
End the game without killing any monsters
Collect all wooden dolls.
Collect all of the psychiatrist's notes.
Collect all dog tags of the fallen comrades.
Pick up all the trash.
Collect all victim's photos.
Become Carver
Patch things up with Jess.
Help Ellis to get his redemption.
Find out what happened to Peter.
Find out what happened to Bullet.
Let the VA know about the lumberjack's death.
Make the pizza guy lose it.
Pay your respects to sheriff Lanning.
Collect the first dog tag.
Collect the first psychiatrist's note.
Break 10 totems.
Kill 10 monsters.
Let Bullet bring you 10 things
Walk 100 miles...
Kill your first monster.
Collect the first victim's photo.
Pet the dog
Collect the first wooden doll.