你这个方法 我刚刚给你的英文资料 后面也提到了 但我一想要联网 就没写上去 可是可以的
英文资料
If you unlock this while playing through the main story you will be very lucky. The best way to earn this achievement is to start a private free-roam session and head to the fort in Mexico called El Presidio. In this fort you will find several Cannons and a Gatling Gun. Once inside alert the army, you can now sit on a cannon or gun of choice and gun down the army as they come to arrest you. The cannon on the cliff edge on the northern side seems to be the best cannon to use.