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