Because Assassin's Creed does not give you clear objectives for a single memory, you are free to approach an assassination memory in any way you want, although it is recommended to stay in stealth like a true assassin, unless the circumstances are dire. For the first two memory blocks, 2 Investigations are needed to access the Assassination Memory; onwards, 3 Investigations would be needed for each Assassination Memory. It is recommended to complete all Investigations for full synchronization. Climb a view point to locate investigations. You can click the Memory Blocks and the memories inside the Additional Memories for Youtube walkthroughs on good stratagies and/or locations for collectibles. It is recommended to synchronize with all viewpoints, save all citizens, and collect all of the additional memories collectibles as you visit new districts to complete each Assassination Memory rather than save everything for after completion of the game. Saving all citizens can help with Assassination Memories when the circumstances fit...

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Memory Block	Setting		Memory	Progress
					Welcome to the Animus
Memory Block 1	Solomon's Temple - Jerusalem		Acquisition
			Failure
			Guardian
			Glory		Hero of Masyaf
Memory Block 2	Traitor - Masyaf		Investigation
			Investigation
			Investigation
			Knowledge		The Punishment for Treason
	Tamir - Damascus		Investigation
			Investigation
			Investigation
			Investigation
			Investigation
			Investigation
			Knowledge
			Assassination		The Blood of a Corrupt Merchant
			View Points	9 / 9
			Save Citizens	12 / 12
Memory Block 3	Garnier de Naplouse - Acre		Investigation
			Investigation
			Investigation
			Investigation
			Investigation
			Investigation
			Knowledge
			Assassination		The Blood of a Doctor
			View Points	11 / 11
			Save Citizens	12 / 12
	Talal - Jerusalem		Investigation
			Investigation
			Investigation
			Investigation
			Investigation
			Investigation
			Knowledge
			Assassination		The Blood of a Slave Trader
			View Points	9 / 9
			Save Citizens	12 / 12
Memory Block 4	Abu'l Nuqoud - Damascus		Investigation
			Investigation
			Investigation
			Investigation
			Investigation
			Investigation
			Knowledge
			Assassination		The Blood of the Merchant King
			View Points	10 / 10
			Save Citizens	10 / 10
	William of Montferrat - Acre		Investigation
			Investigation
			Investigation
			Investigation
			Investigation
			Investigation
			Knowledge
			Assassination		The Blood of the Liege-Lord
			View Points	11 / 11
			Save Citizens	9 / 9
	Majd Addin - Jerusalem		Investigation
			Investigation
			Investigation
			Investigation
			Investigation
			Investigation
			Knowledge
			Assassination		The Blood of a Regent
			View Points	6 / 6
			Save Citizens	8 / 8
Memory Block 5	Sibrand - Acre		Investigation
			Investigation
			Investigation
			Investigation
			Investigation
			Investigation
			Knowledge
			Assassination		The Blood of a Teutonic Leader
			View Points	9 / 9
			Save Citizens	7 / 7	Defender of the People: Acre
	Jubair Al Hakim - Damascus		Investigation
			Investigation
			Investigation
			Investigation
			Investigation
			Investigation
			Knowledge
			Assassination		The Blood of a Scribe
			View Points	7 / 7
			Save Citizens	8 / 8	Defender of the People: Damascus
Memory Block 6	Robert de Sable - Jerusalem		Investigation
			Investigation
			Investigation
			Investigation
			Investigation
			Investigation
			Knowledge
			Assassination
			View Points	7 / 7
			Save Citizens	6 / 6	Defender of the People: Jerusalem
			Assassination		Disciple of the Creed
					The Blood of a Nemesis
Memory Block 7	Al Mualim - Paradise		Assassination		The Eagle and The Apple - 1191
					Visions of the Future
Additional Memories	Ribonucleic Memory		View Points	12 / 12	Fearless
			Kill All Templars	60 / 60	Personal Vendetta
			Assassins Flags	20 / 20	Keeper of the Creed
			Hospitalier Flags	33 / 33	Keeper of the 8 Virtues
			Templar Flags	34 / 34	Keeper of the Order
			Teutonic Flags	33 / 33	Keeper of the Black Cross
			Saracens Flags	100 / 100	Keeper of the Crescent
			King Richard Flags	100 / 100	Keeper of the Lions Passant
			Jerusalem Crosses	100 / 100	Keeper of the Four Gospels

The following achievements and trophies can be achieved during one or multiple playthroughs of the game, or in free roam after Story Completion. These are discussed in a separate section as these are may or may not naturally happen during first playthrough of the game. Do note that trophies only exist for the Xbox 360 Version of the Game and do not exist on PC or Playstation Consoles.

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Absolute Symbiosis

Desmond and Altair have been completely synchronized.

This achievement can come naturally as your Synchronization with Altair increases for every few objectives that you complete. These objectives include saving citizens, synchronizing with view points, and getting your ranks reinstated by Al Mualim after each Assassination Memory back in Masyaf. Keep completing objectives throughout all memory blocks and this achievement will show up eventually.

Hungerer of Knowledge

See 85% of all the memory glitches.

This achievement can come naturally as you view glitches during a scene. Press any button when you see a glitch during a scene to view it in another perspective. Keep viewing glitches during any scene you encounter and this achievement will eventually pop up.

Conversationalist

Go through every dialog with Lucy.

This achievement is easily missable and can be avoided. To get this achievement, you have to participate in all dialogue with Lucy. At the end of each memory block, Desmond can talk with Lucy before resting in the bedroom. Exhaust all possible dialogue with Lucy until she asks you to go rest. Do this every day after the end of a memory block and you will unlock the achievement by the end of memory block 6.

Eagle's Will

You remain undefeated for over 100 battles.

This achievement can come naturally as you play the story and kill guards during a fight. To get this achievement quicker, run around the city and kill every guard you see in a fight. You do not have to do this in one go, you can stop and come back later as your progress will be saved.

Eagle's Flight

Survival at its best, for over 10 minutes, nothing was able to hinder your flight.

This achievement can come naturally as you play the story and engage in combat with guards and/or enemies. To get this achievement, you have to last 10 minutes in open conflict. The easy way to do this is by blocking a single guard's attacks continuously or let guards chase you around the map until the achievement pops up.

Eagle's Prey

Over 100 city guards have fallen to your hunt.

This achievement can come naturally as you play the story and perform assassinations with your hidden blade. To get this achievement you have to assassinate 100 guards. This is most easily done by assassinating guards you see roaming around in the city and on the rooftops. You do not have to do this in one go, you can stop and come back later as your progress will be saved.

Blade in the Crowd

Like a Blade in the Crowd, your target never knew his death laid wait within his very shadow.

This achievement can come naturally as you play the story and go for stealth assassinations on your main targets of the memory block. To get this achievements you essentially have to kill one of your main targets like a true assassin and stealth assassinate them without letting them know that they are about to die. You can stealth assassinate Tamir, Garnier de Naplouse, William of Montferrat, Majd Addin, and Sibrand if you follow good strategies.

Eagle's Challenge

You were bold enough to challenge 25 soldiers in a single fight... and win.

This achievement can come naturally as you play the story and kill guards during a fight. To get this trophy you have to kill 24 guards in a single fight. The easy way to do this is during an assassination memory when you are faced against a lot of soldiers and the target, or you can also find groups of guards in the city, start a fight, and then keep gathering groups of guards. Keep killing guards until a few remain, then find another group of guards and have your opponents follow you, then rinse and repeat until the achievement shows up.

Eagle's Swiftness

Over 100 people have witnessed your deadly performance with a blade.

This achievement can come naturally as you play the story and perform counter kills on guards during a fight. To get this achievement you basically have to counter kill 100 people in a fight. You do not have to do this in one go, you can stop and come back later as your progress will be saved.

Eagle's Dive

Perform 50 Combo Kills in Fights.

This achievement can come naturally as you play the story and perform combo kills on guards during a fight. To get this achievement you basically have to combo kill 50 guards in a fight. You do not have to do this in one go, you can stop and come back later as your progress will be saved. The easiest way to do this is by using the training courtyard back in Masyaf, you can do it consecutively here until the achievement pops up.

Eagle's Talon

Over 50 people have felt the deadly sting of your blade.

This achievement can come naturally as you play the story and perform stealth assassinations on guards during a fight. To get this achievement you basically have to stealth assassinate 50 enemies. You do not have to do this in one go, you can stop and come back later as your progress will be saved.

Eagle's Dance

You've soared with the eagles and landed safely over 50 times.

This achievement can come naturally as you play the story and perform leaps of faith. To get this achievement you basically have to perform 50 leaps of faith by jumping from a high point into a stack of hay below. This can be easily done as you climb to viewpoints across all cities for 100% synchronization of all the View Point Memories.

The hands of a Thief

You've gathered quite a supply of throwing knives.

This achievement is easily missable and can be avoided. To get this achievement you have to pickpocket 200 throwing knives. You can pickpocket thugs for Throwing Knives, and can recognize them by their leather hood and knives at their belts. Make sure to get ranks reinstated by Al Mualim so your max capacity for throwing knives can be increased and therefore can steal more from thugs.

March of the Pious

Scholars know you well and have helped you over 20 times.

This achievement is easily missable and can be avoided. To get this achievement you have to use scholar blending 20 times. You can find groups of scholars to blend with when entering a city for the first time by saving citizens outside the premises first. You do not have to do this in one go, you can stop and come back later as your progress will be saved. To get this trophy quicker, you can blend in and out of the same group of scholars 20 times.

Eagle's Eye

Over 75 guards were felled by your knives.

This achievement can come naturally as you play the story and kill guards with throwing knives. To get this achievement you have to kill at least 75 guards with throwing knives. This is most easily done on rooftop guards and guards that aren't aware of your presence. You do not have to do this in one go, you can stop and come back later as your progress will be saved.

Enemy of the Poor

You managed to scare away 25 beggars. I hope you're proud of yourself.

This achievement is easily missable and can be avoided. To get this achievement you have to grab and throw 25 women harassers (yes, we do not believe in sexism here). During a memory or on free roam, you can sometimes find a beggar run up to you and harass you for food or money (it is typically women), in which you can grab them and then throw. You do not have to do this in one go, you can stop and come back later as your progress will be saved.

Gifted Escapist

The Merchants of the land now know you VERY well.

This achievement is easily missable and can be avoided. To get this achievement you have to jump through 20 merchant stands. You can do this during Informer Merchant Stand Destruction Challenge memories or during free roam. You do not have to do this in one go, you can stop and come back later as your progress will be saved. To get this trophy quicker, you can jump through the same merchant stand 20 times.