Here is the full list of all 22 Strangeland achievements.
The Stranger escaped Strangeland.
Got the final knife.
Exited the Hall of Mirrors.
Reached the Hall of Mirrors.
Correctly identified the Young, Middle Age, and Old Strangers.
Got Tooth.
Killed the Crab.
Persuaded Nineveh to hone Beak.
Heard all the Clown's jokes.
Opened the box.
Released the Dark Thing.
Got Beak.
Starting Out.
Died every possible way.
Won the Shooting Gallery on the highest speed.
Gathered all the spirits using the torch.
Resisted opening the box.
Lasted as long as Rosencrantz and Guildenstern.
Talked to all the major characters.
The Stranger jumped.
The Stranger killed himself.
The Stranger died fighting.