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