Full list of all 13 Subject 13 achievements worth 1,000 gamerscore. It takes around 6-8 hours to unlock all of the achievements on Xbox One.
It's been a long time since a Subject tried to cheat. You're the best.
You chose difficulty and grey matter. You are now rewarded!
Subject 13? Have you gone? Clearly, you've left our land...
You know everything... Terrifying isn't it?
You solved the 3 monkeys' enigma. You're a genius!
Better than the company of a ball, you've beaten the jungle with your mind!
You've finished the second chapter. Did you need some fresh air, Subject 13?
You've found half of the testimonies. You still have work to do, Subject 13!
You've finished the first chapter! Of course, that was just a warm-up!
You've found the first testimony in a long series.
You chose to talk to the entity and tell it everything. What a gossip!
Are you going to lie to the entity? That's nice!
Finish the final puzzle in less than 20 minutes? Yes, you can do it!