This achievement requires you to get both of the RP requirements in every level of the game. RP is earned by defeating enemies (blue diamonds), breaking open orange boxes (orange diamonds), and collecting stars. Just play through the level and don't worry if you fail to reach the goal. Once you complete the level, press
to restart the level if you didn't get enough RP, and you will begin with around half of the points and RP that you ended the level with. You won't be able to collect the star again, but you won't have any problem getting the required RP by just playing through the level as normal.