From the main menu select Create My Cities. From here, name your city and use the basic editor to create a short track to make this process quicker. Repeat three more times but for your fifth event, after creating the track, use the advanced editor to simply add any object such as a ramp. You will unlock the Getting Creative achievement for using the advanced editor in your track.
Once all 5 events are complete, publish your city by pressing the Y button from the My City menu and you will unlock the Publish a city & City Creator achievements.