As WolfVelocity suggests, this can be done in around 2 minutes from scratch if you have a partner with you. if you've already made some, progress, it will take less time. If you want to also get the Platinom Nom Nom achievement, I'd recommend trying to get platinum medals on all of the freeplay levels together with your partner, so that once you're done obtaining this achievement, you won't have that many to improve on. If you can get platinum medals on all activities with your partner, then you'll obtain this achievement and Platinom Nom Nom, requiring no later score improvement. Playing together with a partner makes it much easier to get platinum medals in the more difficult Space Pop, Rally Ball, and 20,000 Leaks where you need to cover different parts of the screen quickly.