I Don’t BelieveG 30

This is unlocked by finding the alternate ending. (I’m trying to avoid spoilers but you’ve been warned.)



Near the very end of the game a character will hand you a set of keys. Instead of using these keys for their intended purpose, return to the alley you came from and use the keys to unlock the door you previously exited.

Once through the door head back up the several sets of stairs until the credits roll and this achievement unlocks.