This achievement is simple enough once you've learned the basics of each of the level types.
For Timed events, you want to retry the level enough times that you know what's coming next, and once you have the quickest route, play the level and pull off every trick it asks you along the way, it seems a little time consuming however, each successful trick then shaves off of your overall time for the stage. This makes it easy to even beat the dev times.
For Tricks events, it's all about the special ability, keep things going combo wise even if its just a really slow stoppie or wheelie with a basic stunt and then get the biggest air you can and use the special ability as you leave the jump into the air to rack up huge points with a big combo.
For Competition events, there is no real easy way to achieve these, just be aware you don't have to earn all challenges for five stars (that goes for any event) instead, just focus on the trick you are being asked to complete and try and stay up on a high platform to allow to drop off the edge for air time on bigger combo tricks.
Good luck guys!