Gun

This is story related and cannot be missed. At the start of this mission you will need to head to Dodge City, to do this just follow the “Trail to Dodge” and once you reach the river a cut scene will occur. Once the cut scene ends you will be on a ferry crossing the river, get back on your horse and follow the compass to the Alhambra Saloon, and when you get there talk to the bar tender for a cut scene. Once the cut scene ends you will be behind the bar and you will need to make your way upstairs and kill all of the gang members. When you reach jenny you will need to kill the gang member holding her, use quick draw to get a headshot on him and another cut scene will occur. After the cut scene you will need to head downstairs and kill the gang members who are carrying torches to try and set fire to the saloon. As soon as they are dead, head outside and kill the remaining gang members, the best option here is to get on the horse outside the saloon so that you can take down the gang quickly. When they are all dead go back inside the Saloon and a cut scene will occur, as soon as it ends use quick draw and try to kill as many gang members as possible (including Crude), once they are all dead the achievement will unlock.