Cheat Game Assassins Creed

Unlocking doors When you go to bed after Memory Block 2, you will notice your closet door is open. Press any button to get a piece of paper Desmond notes as a code. The code will unlock your bedroom door, which will allow you to be able to go out as often as you like after you go to bed, as well as to open the meeting room area. You can also pick up various items to unlock Lucy's password.
Successfully complete the game, and allow the credits to end. You will be given the access code for the computer attached to the Animus. Hack the computer to access an inbox, outbox, and deleted message. Look at the inbox and choose the email about the conference room. You can go to the conference room and access it via the keypad.

Decoding e-mails from Lucy's computer One item you can pick up after being able to unlock your bedroom door is Lucy's password. You can then investigate her e-mails, which entail a short secondary story line. After you complete the last Memory Block, go back outside your room. Go to Lucy's computer. In "Deleted Items" is an e-mail which entails her talking to someone about a rescue, then the last reply comes back as:

WondEr Why It is everyone Laughs at you?
i'll Let you guess.
let's just say she's proBably gEtTing it bigger and better from someone else tHat isn't you.
how can you hope to compEte?
REst asSured there are sOme gOod ways.
click the liNk to see!

Removing the capital letters out of the message decodes the message as:

WE WILL BE THERE SOON

Hidden messages After killing Al Muaiam and returning to the real world, listen to the conversation about how they going to kill you. Turn on your Eagle Vision, and look at the floor. There are some mixed up letters on both sides of the Amnius. You should see on the side closest to the main door:

M O R Y M N O E S
E N C E O L C H T
H O N B T L O T C
T D E O S A T O A
P E D S N L S T F
L D D U O O E T E
E A I E I R I N T
H S H K T T K E R
T U A A A N S S A

To decode this, start reading at the bottom right hand corner to the top right hand corner, so you will start at "A" and stop at "S". It will spell a real word. Do this for all of the columns and it will read:
ARTEFACTS SENT TO THE SKIES TO CONTROL ALL NATIONS TO MAKE US OBEY A HIDDEN CRUSADE DO NOT HELP THEM
Next, do the same thing to the mixed letters on the other side of the Amnius:

A
D R H
O O D T M
W H B I T D O
E U S Y S I N S E
A R O O M R E A Y N R
I S E Y T N I D L M I D E
T W I H W Y I E A U D A Y H T

It will spell out:
THEY DRAINED MY SOUL AND MADE IT THEIRS I DRAINED MY BODY TO SHOW YOU WHERE I SAW IT

Assassinations

Loud assassination: Hold LT + RT and press X. You can do this while running up to a guard, and it almost always works from any angle. However, it is noisy and causes civilians to run for guards. Silent assassination: Hold LT and press X. It has less of a chance of working, and works best when used behind guards so no one hears you.

Assassination in Jerusalem When you go to Jerusalem and do the assassination with the guards surrounding you, do not try to fight them off. Instead, turn around and run up the ladder to get to the second floor. A short intermission sequence will show your target running away and up another ladder. Hold RT + A and run across the chandeliers. The ladder will be to the right. Run up the ladder, and another short intermission sequence will show your target on top of another building. Chase him down, and have your wrist blade enabled (press Up). Then, press LT to lock onto your target while still chasing him down. When you get close enough, the word "Assassinate" will appear for X in the upper right of the screen. Press it to complete your task. After another intermission sequence, evade the guards by jumping onto building roofs, hiding, etc. Make your way over to the bureau to complete the memory.

Defeating Al Mualim When fighting the Master, he will take away your ability to use radar and make it difficult to see. This also allows him to hit you once and kill you. Lock on to him, and use a throwing knife against him. This will take away his power to blind you and make him easier to kill.
The first part is simple. Take out your sword, as you will be fighting all your previous assassination targets. They are fairly easy to kill. Only one counter is required to kill each of them. For the second part, as soon as Al Mualim releases you, use your Eagle Vision. The real Al Mualim is the one in yellow. Focus your attacks on him. In the third part, Al Mualim takes away your synchronization bar and radar, allowing him to kill you in one hit. Take out your throwing knives. Look for the Piece of Eden in his hand. Once you see him, throw a knife at him. Then, just counterattack/grab break him. Keep repeating this until he says, "Damn you Altair!" Finish him off with your hidden blade or keep attacking him with your sword until he is dead.

Defeating Templars When initiating combat against a Templar, press LT to lock on to him. Then, quickly equip the hidden blade. Wait for him to attack you so that you can counter attack, killing him in one blow. This is better than the sword fight. If you counter with the sword, you will only knock him down and not kill the Templar.

Defeating William of Montferrat in Acre After the guards (or most of them) leave William, drop down from the castle, and slay William. Then, "de-target" or deselect, and run up into the castle buildings and battlement to get away. This is the fastest way of completing the mission.

Easy "Eagle's Challenge" achievement In Memory Block 1, after Al Mualim sends you to defend the fortress against the Templar attack, wait at the intersection/fork that is about 135 feet from the destination, just after the hill/path that leads to the Creed building. Guards will continuously respawn down the right fork. You can just stand still and kill 25 guards as your status will never leave "exposed" until you go to the destination.
Go to the entrance of Acre, but go through Kingdom. There is a base of soldiers. Start killing them, but do not finish all of them. Start running to gather more. Kill a few, then run again. Do this until you get the achievement. If you take long time, you may also unlock the "Eagle's Flight" achievement.

Easy "Eagle's Dive" achievement In Masyaf, go to the castle. Enter the training arena, and choose the option for combo kill. When you succeed three times, the match will end. Select it again, and continue until you get the achievement.

Easy "Eagle's Flight" achievement When you first reach Damascus and must save the citizen, kill two of the three guards. Back yourself into a stall or a corner that you cannot be pushed out of, then hold RT to guard. In ten minutes you will get the achievement. You can also put a rubber band around your controller and RT, and allow the game to idle.

Easy "Eagle's Will" achievement In the area after you first start the game, just after you see the Knights Templar, enter the room containing the Ark Of The Covenant. Move towards the ladder in front, and jump to the left of it, as if to grab onto the ledge on the wall. You should fly through the wall and land behind it on a square outline. Walk towards the middle of this square, and you will fall through, dying shortly afterwards. After you die, you should get the "Eagle's Will" achievement.

Easy "Gifted Escapist" achievement Go into any of the main cities. It is probably easiest to go to Damascus, Poor District. Find a merchant stand, and start hopping through it. If you can find two that are next to each other, it saves time. Keep jumping through the merchant stand(s) until you get the achievement.

Easy "March of the Pious" achievement This achievement is probably easiest to unlock in Damascus. Save the citizen in front of the main gates if you have not already done so. If you have already done that, go to the scholars. Blend in with them. As they get past the main array of guards, start pressing Deblend continuously. You should be going in and out of blend mode continuously. After a short time, you should get the achievement.

Easy "Visions of the Future" achievement After you complete the game, walk to your bedroom, and use Eagle Vision on the wall behind your bed. Scan it from left to right, and then the credits will begin. Once they end, you will get the achievement. -From: kodiak4wheelin

Transformers reference Go to the southwestern-most vigilantes in the poor district of Damascus. On one of the buildings around them, you should see an outcropping in the wall, climb on it to see it looks exactly like G1 Optimus Prime in vehicle mode. Note: There may be more than one outcropping in the area, so look carefully. If you lose sight of the vigilantes, you have gone too far.