Achievements - How to unlock

The Eagle and The Apple - 1191 (100)
Complete Assassin's Creed.

Personal Vendetta (40)
Kill every Templar.

Keeper of the Lions Passant (25)
Find All of Richard's Flags in the Kingdom.

Keeper of the Creed (10)
Find All Flags in Masyaf.

Keeper of the Four Gospels (20)
Find All Flags in Jerusalem.

Keeper of the Crescent (20)
Find All Flags in Damascus.

Absolute Symbiosis (45)
Have a complete Synchronization bar.

Fearless (25)
Complete all Reach High Points.

Hungerer of Knowledge (20)
See 85% of all the memory glitches.

Defender of the People: Acre (20)
Complete every free mission in Acre.

Defender of the People:Jerusalem (20)
Complete every free mission in Jerusalem.

Defender of the People: Damascus (20)
Complete every free mission in Damascus.

Conversationalist (20)
Go through every dialog with Lucy.

Disciple of the Creed (30)
Assassinate all your targets with a full DNA bar.

Eagle's Will (20)
Defeat 100 opponents without dying.

Eagle's Flight (20)
Last 10 minutes in open conflict.

Eagle's Prey (20)
Assassinate 100 guards.

Blade in the Crowd (30)
Kill one of your main targets like a true assassin.

Eagle's Challenge (20)
Defeat 25 guards in a single fight.

Eagle's Swiftness (20)
Perform 100 Counter Kill in Fights.

Eagle's Dive (20)
Perform 50 Combo Kills in Fights.

Eagle's Talon (15)
Perform 50 stealth assassinations.

Eagle's Dance (10)
Perform 50 leap of faith.

The hands of a Thief (15)
Pickpocket 200 throwing knives.

March of the Pious (5)
Use Scholar blending 20 times.

Eagle's Eye (15)
Kill 75 guards by throwing knives.

Enemy of the Poor (5)
Grab and Throw 25 Harassers.

Gifted Escapist (5)
Jump through 20 merchant stands.

Keeper of the Black Cross (10)
Find All Teutonic Flags in Acre.

Keeper of the Order (10)
Find all Templar Flags in Acre.

Keeper of the 8 Virtues (10)
Find All Hospitalier Flags in Acre.

Secret Achievement (50)
Continue playing to unlock this secret achievement.

Secret Achievement (25)
Continue playing to unlock this secret achievement.

Secret Achievement (20)
Continue playing to unlock this secret achievement.

Completion bonuses - Successfully complete the game. When the Memory Blocks are played again in Story mode you can kill anyone without penalties.

Additionally, you will be able to use Eagle Vision at any time regardless of Synchronization levels inside of the Animus.

Defeating the Master - 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.

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 the achievement is unlocked.

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 have the achievement. You can also put a rubber band around your controller and LT and allow the game to idle.

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 "Vision 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 and right the credits will start. After they end you will get the achievement.

Easy citizen missions - When helping a citizen, do not just attack the guards. Hold the 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 fights - Note: Only attempt this technique if they are fluent in the Rank 2 skill "Counter" and they have enough synchronization bars (a.k.a., life bars). One and a half rows of bars will do. When in battle, equip your hidden blade. With this equipped, all of your counters will score an instant kill. You can even instantly kill tougher ranked guards (for example, the Teutonic guards in Acre when hunting Sebrand). Also, most of the time using the hidden blade in battle will scare the last one or two (even three if you are lucky) guards, causing them to run away. However because you do not have a weapon that is sufficient enough to block a full sized enemy blade, all incoming attacks will hurt you. When in battle, if you see a guard you are fighting physically emote in any way (for example, taunting you or cowering in fear), press Low Profile Assassinate while facing them to score an instant kill without having to counter.

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.

Kill people without penalty - After you beat the game go on story mode and kill people and you won't lose life.

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.

Osiris Heaven - When you first reach Damascus after saving the citizen you will learn how to blend with scholars. Enter this blend and exit it twenty times very quickly to unlock the achievement.

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.

Transformers reference - Travel 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 and you will see that it looks exactly like G1 Optimus Prime in vehicle mode. Note that 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.