Liberate all districts in Boston OR New York. (8)

This trophy has a number of steps to it. Firstly, you need to liberate all 3 Districts in either New York or Boston. This is done by first completing 6 quests in all areas of Boston and West New York, and 9 in North and East New York. These quests are in sets of 3, and usually involve menial tasks and killing guards.

Once all 6 missions are completed, visit the Liberation Contact in the area and he will provide you with a short mission which involves you killing a Templar using a new Assassin ability. Once you do this, the District will be liberated and the contact will join you as an Assassin.

Then, once all 3 Districts are liberated, you unlock the final Liberation Mission for the whole city, which involves assassinating a target in a restricted area. Once the job is done, you will earn this trophy and prices in shops across the area will be considerably cheaper.