Risen

For this, you have to play for the Don and be a Hunter or Fighter. Early in chapter 1, reporting to the Don on your talks with Mendoza, you will be tasked with finding the 4 of 5 discs needed to open the volcano door, but for the Don instead of Mendoza. The Don is going to use the discs as a bargaining tool. Once you have the 4 discs, return to the Don for the last one and he will want you to bargain the discs for control of Harbour Town. You will be given the quest Esteban's Return to Harbour Town. Simply take the discs to Mendoza at the top of Volcano Keep and lay out your demands, ones he will agree to. You have to assist in opening the doors first, but after that you are free to conclude this quest by going to Harbour Town and talking to Carlos. As soon as you do, the Order warriors will pull out of town and this achievement is yours.