Like A Boss

Like A Boss is one of the easy tasks in the Falador set, which can be found in the Achievements tab of the Notice Board. To start this task, travel to Lumbridge and speak to the doomsayer. The doomsayer is located Northeast of the castle entrance, standing on a box by the bridge. Right click on the doomsayer and choose "Toggle Warnings-Doomsayer". A list of Warning Messages will pop up. Scroll to the bottom of the list and select "Goblin Raid Warning" to turn it on. If it is green, it is turned on.

Next, travel to the Goblin Village. Start killing random Goblins. You will get a message that tallies your kills. When you have killed 15 goblins, the Boss Gobllin appears to defend his friends. Finally, you can kill the Boss Goblin.