Hi Guys,
here is my Solution for this Achievement. Load DNA Sequence 5-2 and play until the Point where kill the "hidden" Shooters of the Rooftop.
After this, you have automatically the highest Notorious. Jump down from the Rooftop and fight the normal Enemies.
After a couple of seconds the Jagers enter the Fight. To kill this Jagers easily wait for a Attack and counter this with B+A then X Combo. Repeat this until all Jagers down, if you have not 10, run into the next Group of Enemies and repeat this Steps.
Regards
PS: More AC3 Videoguide found you here -
http://www.youtube.com/playlist?list=PLuGZAFj5iqHcNAlGL214X0...