This guide describes how you can get all of the hidden ‘dead ends’ in the game. Spoiler Alert!!!
Then don’t do anything and just wait. Eventually you’ll freeze to death and get the achievement.
Might have to switch around between your body and the puppet for a few times.
Previously was possible to obtain through other means but they were removed.
Thanks to Hex for his great guide, all credit to his effort. you can also read the original guide from Steam Community. enjoy the game.