This achievement is awarded after completing the following missions in Sequence 1 - A Sort of Homecoming with at least 50% synchronization:
Memory 1 - The Hangman
Memory 2 - A Narrow Escape
Memory 3 - A Journal of Some Kind
Memory 4 - A Hard Ride
Memory 5 - The Wounded Eagle
For those of you going for
there are some videos posted below that should help you achieve 100% synchronization in each memory. The videos do not belong to me and I do not take credit for them.