Full list of all 12 Back In 1995 achievements worth 1,000 gamerscore. It takes around 1-2 hours to unlock all of the achievements on Xbox One.
Complete game with second ending.
Get the flashlight.
Complete game with first ending.
Clear the fourth stage.
Collect Dr. Randell newsclips.
Clear the third stage.
Get the shotgun.
Clear the second stage.
Get the pistol.
Get the pipewrench.
Clear the first stage.
Clear the opening sequence.