Full Synchronisation Requirement - Save all citizens who are under attack.
In this Memory you control the young Altair, before the events of Assassin’s Creed. After the cutscene, head up the hill and keep a close eye on your minimap for dark circles which indicate a citizen under attack by the Templars. Reaching them and killing their attackers is a requirement for 100% Synchronisation in this Memory, so make sure to not waste time and try and get to them as quickly as possible. There are four in total to save, and the optional objective completed notification will appear when you get them all. After saving them, fight your way up the hill to Masyaf fortress. After being confronted by the traitor at the gate, scale the wall and use a ledge assassinate to take out the patrolling Templar on top of the wall. Proceed down the hill, taking out the patrolling Templars with assassinates or silent ranged attacks. When you reach the traitor, assassinate him before he can kill any more of the captured assassins, and Al Mualim will break free of his captors.