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