Ok I just picked the game back up, I had stopped playing for a while and never beat it. I am in Acre and it says I am in memory block 4 on the map screen. The only objectives it is showing are vigilantes and scholars, however under status it says /6 investigations complete. 3 investigations are needed to access assassination memory. I have ran around in circles for hours and i do not know what i need to do now. I have went to Altair and he says my work is not yet done, but i cant figure out where i have to go next?? can someone please help me so i do not have to restart the whole game to figure this out?? Thanks!

no...what you prolly need to do is find more viewpoints and then clear up the map for more objectives...i had a similar problem so everytime i go to a city, i just find all the viewpoints and free up the missions...try that and see if that clears the problem up

also, you might accidently made it so the map only show's certain things, such as just the scholars, but yes i agree with steven check all the veiw points to see if you have climbed them AND synchronixed them.

go to the assassins bereau

Look for eagle looking thingies on your map and climb em.