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