Full Synchronisation Requirement - Do not kill anyone with blades
Approach the two guards at the lighthouse-like tower. If you want to get 100% synchronisation, you’ll need to avoid using your sword, dagger, and Hidden Blades. So other options here are to use bombs, any type that may kill or stun them for you to kill them after, the crossbow, poison, or your recruits.
If you have them, use Shrapnel Bombs to clear the first couple of guards, then poison darts and the crossbow for the remaining two patrolling. Head to where the chain joins the tower and interact to plant the special bomb. From now on, it’s easiest to just run past all the Janissaries and Templars who try to stop you – remember to use bombs to make this easier and be careful to not assassinate some of them on reflex! Run for the Greek fire cannon mounted on the deck of the nearby ship, and use it to set the three large galleons and the smaller boats alight. You need to keep burning them until the counter reaches zero, so aim for where the shots and cannonballs are coming from to take our your attackers before they reduce your health to zero.
Once you’ve dealt with them, leap to the destroyed sail then jump from there to the beam joining the two boats. Turn right and head to the objective marker, then jump and use the hookblade to long jump from the lantern. Continue onwards and leap off of the bow of the ship to another. After the short scene, run straight to the end of the boat and jump off for another short cutscene. Next up, turn left, drop down the ledge and simply run past the guards (remember how to hook and run, anyone?) to the bow again, and jump to the last boat – your transportation to Cappadocia – bringing the Memory and the Sequence to an end.