Full list of all 44 Assassin's Creed achievements worth 1,000 gamerscore. It takes around 20-25 hours to unlock all of the achievements on Xbox 360.
Achievements they've won
Achievements they've not won
Go through every dialog with Lucy.
A strange vision has appeared to you. What could it mean?
Complete Assassin's Creed.
You've slain Robert de Sable, but there is one more...
See 85% of all the memory glitches.
Assassinate all your targets with a full DNA bar.
Defeat 25 guards in a single fight.
Complete all Reach High Points.
Find All Flags in Jerusalem.
Complete every free mission in Jerusalem.
Kill every Templar.
You've slain Sibrand, the Teutonic Leader of Acre.
Find All Teutonic Flags in Acre.
Complete every free mission in Acre.
Perform 50 Combo Kills in Fights.
You've slain Jubair, the Scribe of Damascus.
Find All Flags in Damascus.
Complete every free mission in Damascus.
Pickpocket 200 throwing knives.
Grab and Throw 25 Harassers.
Have a complete Synchronization bar.
You've slain Majd Addin, Regent of Jerusalem.
Defeat 100 opponents without dying.
Kill 75 guards by throwing knives.
You've slain Abul Nuqoud, Merchant King of Damascus.
Assassinate 100 guards.
Find All of Richard's Flags in the Kingdom.
You've slain William of Montferrat, Liege-Lord of Acre.
Find all Templar Flags in Acre.
You've slain Talal, Slave Trader of Jerusalem.
Kill one of your main targets like a true assassin.
Jump through 20 merchant stands.
Last 10 minutes in open conflict.
Perform 50 stealth assassinations.
Perform 50 leap of faith.
You've slain Garnier de Naplouse, Hospitalier Leader in Acre.
Find All Hospitalier Flags in Acre.
Perform 100 Counter Kill in Fights.
Find All Flags in Masyaf.
You've slain Tamir, Black Market Merchant in Damascus.
Use Scholar blending 20 times.
You have found the traitor and have brought him before Al Mualim.
You've protected Masyaf from the Templar invasion.
You've successfully completed the Animus tutorial.