Completion bonus
Successfully complete the game. When the Memory Blocks are played again in Story mode, you can kill anyone without penalty. Additionally, you will be able to use Eagle Vision at any time regardless of Synchronization levels inside of the Animus.

Escaping from guards
Go to a high roof when chased. Kill the guards that appear. After a few kills, they will either run or give up.

Easy citizen missions
When helping a citizen, do not just attack the guards. Hold LT and press X with the dagger ready. This will eliminate one of the guards and give you a better chance. Sometimes you can assassinate two guards before they notice you.

Easy kills
Equip your hidden blade. Press B to throw an enemy to the ground. While they are lying on the ground, press X to stab them. This is especially useful when surrounded by enimies or when assassainating targets.

Easier interrogations
After you get the "target" to a safe area to "interrogate" them, punch them first then "grab" them for faster completions. It will take about two grabs to quickly finish them. However, in the last three quarters of the game, you may have to grab them up to four times.

Easier game
To lower the time needed to complete the game and decrease the difficulty of each major assassination, do the following in order (with the exception of Masyaf):

Unlocking your bedroom door
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.

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 LB + RB 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 LB and press X. It has less of a chance of working, and works best when used behind guards so no one hears you.

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.

Achievements
Accomplish the indicated achievement to get the corresponding number of Gamerscore points:

The Eagle and The Apple - 1191 (100 points): Complete Assassin's Creed.
Personal Vendetta (40 points): Kill every Templar.
Keeper of the Lions Passant (25 points): Find All of Richard's Flags in the Kingdom.
Keeper of the Creed (10 points): Find All Flags in Masyaf.
Keeper of the Four Gospels (20 points): Find All Flags in Jerusalem.
Keeper of the Crescent (20 points): Find All Flags in Damascus.
Absolute Symbiosis (45 points): Have a complete Synchronization bar.
Fearless (25 points): Complete all Reach High Points.
Hungerer of Knowledge (20 points): See 85% of all the memory glitches.
Defender of the People: Acre (20 points): Complete every free mission in Acre.
Conversationalist (20 points): Go through every dialog with Lucy.
Disciple of the Creed (30 points): Assassinate all your targets with a full DNA bar.
Eagle's Will (20 points): Defeat 100 opponents without dying.
Eagle's Flight (20 points): Last 10 minutes in open conflict.
Eagle's Prey (20 points): Assassinate 100 guards.
Blade in the Crowd (30 points): Kill one of your main targets like a true assassin.
Eagle's Challenge (20 points): Defeat 25 guards in a single fight.
Eagle's Swiftness (20 points): Perform 100 Counter Kill in Fights.
Eagle's Dive (20 points): Perform 50 Combo Kills in Fights.
Eagle's Talon (15 points): Perform 50 stealth assassinations.
Eagle's Dance (10 points): Perform 50 leap of faith.
The hands of a Thief (15 points): Pickpocket 200 throwing knives.
March of the Pious (5 points): Use Scholar blending 20 times.
Eagle's Eye (15 points): Kill 75 guards by throwing knives.
Enemy of the Poor (5 points): Grab and Throw 25 Harassers.
Gifted Escapist (5 points): Jump through 20 merchant stands.
Keeper of the Black Cross (10 points): Find All Teutonic Flags in Acre.
Keeper of the Order (10 points): Find all Templar Flags in Acre.
Keeper of the 8 Virtues (10 points): Find All Hospitalier Flags in Acre.
Additionally, there are thirteen secret achievements:

Welcome to the Animus (20 points): Successfully complete the Animus tutorial.
Hero of Masyaf (20 points): Protect Masyaf from the Templar invasion.
The Blood of a Regent (25 points): Slay Majd Addin, Regent of Jerusalem.
The Blood of a Scribe (25 points): Slay Jubair, the Scribe of Damascus.
The Blood of a Nemesis (25 points): Slay Robert de Sable in front of King Richard.
Visions of the Future (50 points): When available, Eagle Vision your bedroom wall.

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