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
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.
Find All Flags in Jerusalem.
Complete all Reach High Points.
Kill every Templar.
Complete every free mission in Jerusalem.
You've slain Jubair, the Scribe of Damascus.
See 85% of all the memory glitches.
You've slain Sibrand, the Teutonic Leader of Acre.
Find All Teutonic Flags in Acre.
Complete every free mission in Acre.
Find All Flags in 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.
Find all Templar Flags in Acre.
Perform 50 Combo Kills in Fights.
Find All of Richard's Flags in the Kingdom.
You've slain Abul Nuqoud, Merchant King of Damascus.
Grab and Throw 25 Harassers.
Kill 75 guards by throwing knives.
Last 10 minutes in open conflict.
Defeat 25 guards in a single fight.
You've slain Talal, Slave Trader of Jerusalem.
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.
Kill one of your main targets like a true assassin.
Assassinate 100 guards.
Defeat 100 opponents without dying.
Use Scholar blending 20 times.
Perform 50 stealth assassinations.
Jump through 20 merchant stands.
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.