The Prince's Banquet
To start the memory, talk to Yusuf. The first section has the bonus objective. You need to beat Yusuf to the first waypoint. You will start out with the lead so just make sure that you don't get greedy and cut a line too close to the edge or to a wall. Once you get to the checkpoint, the next phase will start. Drop down and punch each of the minstrels once, then pick up the bodies and put them in the haystack. Do that for the next group and the group after as well.
This last group is a little bit tricky to get to. From where you dump the second group, climb the church and go to the corner of the church closest to the wall. Aim for a low part of the wall and jump. Get on the wall and follow it NW until it starts to go lower and you see flower bushes you can Leap of Faith into. Jump into one and take the low path around the outside until you see an unguarded path to the structures in the middle of the restricted area. You can pass entartainers and party goers, just not guards. Get on the roof of the middle buildings and make your way over to the last group of mistrels. Dispose of them.
Head down the stairs and towards the guards blocking entry. Talk to them and start playing the lute. Keep playing until they tell you to go inside. Once you get inside, you'll have to go up to groups of people (important groups are marked with glowing light above them in Eagle Vision) and play the lute. Scan them while you play to find targets. Once you've found a target, you need to put your target at the back of the group by being on the far side of the group and drawing everyone's attention by playing the lute.
Once you've killed the two templars in the courtyard, follow Yusuf inside. Here you will do much the same thing but you will have to do so in close proximity to the Prince. If he gets too far away, you'll fail the mission and if you don't find the Templars fast enough, they will kill him. Mill through the group until you've found all four and then you will find that there is one more. He will charge the prince and you have to kill him before he gets there.
An Uneasy Meeting
You have to return to the Prince's palace to meet up with him again. After talking to him, run up the nearest column to get to the roof. Follow the roof around until it gets you to that tower. Climb the tower and then go in the trap door at the top.
The Fourth Part of the World
This is a Sofia mission. From the start, head right (SW) along the walls and around the corner. From this side of the houses, you can climb to the roof. Use the beams along the wall to jump into the water. Go around the far side of the boat and climb up from the water. If you have an assassin signal, feel free to use it on either guard here. You just need to get up to the higher deck and get the parcel which is a roll of paper on a box. Do so carefully without either of these guards seeing you and you will also get the bonus objective.
After you've gotten the parcel, head back to Sofia's shop by foot.
Signs and Symbols, Part 1
Head to the Hagia Sophia and climb all the way to the top. I mean ALL the way. Once you've gotten to the checkpoint there, activate Eagle Vision and look SE. You want the lower of the two symbols on the dome. Scan that and you will be told to collect the book. If you look down the NW side, you should see the vantage point. Jump off in that direction and you'll land in a haystack. Now you may go collect the book.
Galata Tower
Climb to the top of Galata tower to enter. Head forward and down the spiral staircase to the left. When you reach the bottom of the stairs, turn toward the center of the tower and jump to the lift. You will begin to fall. Guide yourself left around the first obstacle and then right around the next. Keep going right around the third and then back to the center for the fourth.
When you finally stop falling, climb up and around to the inside of the life crane. Keep climbing up until you can't climb up any more. From here, you should be able to jump backwards to the top of the arch. Start making your way to the right along the top of the arch. At the far right side, jump to the platform on the right. Use the zipline to get even further done. Go down into the caverns from here.
When you come to the next large room, you will see a wooden ledge that you can climb up onto. Once there, do a long jump across the gap using the hook. Turn right and climb the wood on the wall. At the top, slide around to the other side of this rock. Keep sliding as far as you can and then jump backwards to the pole. Swing on that and run across the beams in front of you until you come to a solid platform. This platform has a zipline but it can be easy to miss if you just keep running.
Take the zipline, jump forward and turn left. Jump onto the water wheel and slide around to the front of it. Jump backwards onto the plank and then across to the wooden wall. Climb up the wall and jump to the beam on your right. Continue in that direction for a couple of hops and then climb up the wall at the far end. At the top of the wall, zipline down. Keep going until you zipline through a water fall. When you land, run straight up the wall in front of you.
At the top, head right and climb the wall. At the top of that, turn right and jump to the scaffolding. After that collapses, take the zipline down and head left. Do a leap of faith at the water fall. Get out of the water, head right and do a long jump across the gap. Run across the broken bridge and start climbing walls, beams and poles until you get to a zipline at which point you'll begin travelling downward. After the zipline breaks, climb up to the top of the cliff and go into the doorway. Loot the chests and Eagle eye the right wall to find another secret door. Open it to find your second key.
Mentor's Wake
Head back to the Assassin HQ for this mission. When you step into the boots of Altair, you will have to carry Al Mualim down to the pyre below. Light him on fire and you will be tossed off the cliff. A fight will break out. You have to disarm people by countering attacks while unarmed but don't kill anyone. Every time you disarm someone, remember to drop the weapon by pressing down on the d-pad so you don't attack anyone and are ready to disarm the next attacker.
After you fight for a little bit, Abbas will take the Apple and activate it. You need to climb the tower to save him but be careful because the Apple will pulse every so often which may knock you loose. If you do get knocked loose while climbing quickly hammer the grab button and hope you manage to grab a ledge. Try to climb quickly and between pulses to save him before his health runs out. Lastly, don't leave the blue area on the map or you will instantly be desynchronized.
You will have to run up the hill to left side to be able to get to the base of the tower. When you do, make your way up to the second platform. Wait for a pulse, then jump to the beam to the right and from the beam, wall run straight up. Climb up to the top of the tower from here and grab the Apple to save him.
