The achievement is located on the first map called "Goat Ville". I created a video which shows all 19 achievements that can be obtained on this map. In the video I always start from the spawn point and go to the achievement location. The spoiler under the video contains a timeline with all achievements.
The achievement required the large Boulder. Jump over the fence in front of your spawn point and turn right, cross the street and you see a red house. In the garden are some people which give a party. Go forward up to hill and you see the boulder, lick the boulder and cross the street again with the boulder and head to the field. Here you see a circle raceway. Put the boulder on the lane so that the car hits the stone.
The Boulder is also required for this achievement.