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