No Future is a difficulty setting that can be selected only in New Game+. Once you're in New Game+, proceed to your Encyclopedia in your study. Go to the Forbidden Tome and select it. You'll be asked a series of questions. Select "No","No", and finally "No" again. At that point you will now be in No Future mode and your trophy will unlock. If you wish to revert back to Normal so you can finish up any other trophies you need, simply open the Forbidden Tome again and select "Yes" on the first question.