This is story related and cannot be missed. Following “Arrivederci Abstergo”, you will arrive at a warehouse. Continue to follow Lucy and make your way upstairs where you will meet Rebecca Crane and Shaun Hastings. When the cutscene concludes and you have control of Desmond, walk over to each of them to initiate a conversation to learn a little about them. Also speak with Lucy as she has some insight to your emerging powers. When you’re done speaking with them, walk over to the Animus and press a button. You will climb into the seat and when you fall asleep, the achievement will unlock.