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