In Assassin’s Creed: Brotherhood for the PS3, Xbox 360, and PC, you can unlock bits of Cristina’s memory as you progress through the game.
Here is a list of the pieces of Cristina’s memory you can unlock, and how to unlock them.
A Second Chance – Achieve 15% total synch
Last Rites – Achieve 30% total synch
Best Man – Achieve 45% total synch
Persona Non Grata – Achieve 60% total synch
Love’s Labour’s Lost – Achieve 75% total synch