In this next tutorial, not only will you be finding all 27 shade locations in Dante's Inferno, but you'll be unlocking three achievements as well.
You'll find all the 27 shades throughout the entire game, and you can either absolve or punish them. Finding all 27 will unlock The Damned achievement. You can unlock the other two, Old Friend and Forbidden Love, by finding and absolving Francesca da Polenta, Paolo Malatesta, and Brunetto Latini. You'll add 90 gamerscore to your profile when everything is said and done. Good luck!