Law and Order Complete (20) GS

Law and Order, requires you to ride around the town with a couple people doing some trivial tasks. First off, follow the two to the saloon, after you talk to him you'll get ambushed and have to kill around 6 enemies, quickdraw should sort these out. Next, mount the closest horse and sprint after the other horse, you'll be attacked by a couple of people, but just kill them and go towards the destination marker.

After you reach the destination marker, you will have to kill a few people again. After the "law enforcers" will attack you. Keep your distance from the first "law enforcer" because his shotgun will leave a dent in your head, even on easy so look out for this. After the first guy is taken out, you have to face the other, this time outside the barn. Just move close and close to the guy continuously shooting him with the rifle.