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
You've successfully completed the Animus tutorial.
You've protected Masyaf from the Templar invasion.
Kill every Templar.
Find All Flags in Jerusalem.
Find all Templar Flags in Acre.
Find All Teutonic Flags in Acre.
Find All Hospitalier Flags in Acre.
Find All Flags in Damascus.
Find All of Richard's Flags in the Kingdom.
Find All Flags in Masyaf.
A strange vision has appeared to you. What could it mean?
Complete Assassin's Creed.
Go through every dialog with Lucy.
You've slain Robert de Sable, but there is one more...
Assassinate all your targets with a full DNA bar.
See 85% of all the memory glitches.
Complete all Reach High Points.
Complete every free mission in Jerusalem.
You've slain Sibrand, the Teutonic Leader of Acre.
Complete every free mission in Acre.
You've slain Jubair, the Scribe of Damascus.
Complete every free mission in Damascus.
Have a complete Synchronization bar.
You've slain Majd Addin, Regent of Jerusalem.
You've slain William of Montferrat, Liege-Lord of Acre.
Pickpocket 200 throwing knives.
Kill 75 guards by throwing knives.
You've slain Abul Nuqoud, Merchant King of Damascus.
Perform 50 leap of faith.
Assassinate 100 guards.
You've slain Talal, Slave Trader of Jerusalem.
Grab and Throw 25 Harassers.
Perform 50 stealth assassinations.
Perform 50 Combo Kills in Fights.
You've slain Garnier de Naplouse, Hospitalier Leader in Acre.
Defeat 100 opponents without dying.
Perform 100 Counter Kill in Fights.
Defeat 25 guards in a single fight.
Last 10 minutes in open conflict.
You've slain Tamir, Black Market Merchant in Damascus.
Kill one of your main targets like a true assassin.
Jump through 20 merchant stands.
Use Scholar blending 20 times.
You have found the traitor and have brought him before Al Mualim.