Full list of all 13 The Witness achievements worth 1,000 gamerscore. It takes around 15-20 hours to unlock all of the achievements on Xbox One.
Reach the end.
Activate the Town laser.
Activate the Jungle laser.
Activate the Bunker laser.
Activate the Quarry laser.
Activate the Marsh laser.
Activate the Treehouse laser.
Activate the Desert Ruin laser.
Activate the Shady Trees laser.
Activate the Monastery laser.
Activate the Keep laser.
Activate the Symmetry laser.
Complete a certain challenge.