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