Turn N Run

Portals can only be found on the Desert and Mushroom planets. When you step on a portal block, it will warp you across the level (in the same dimension) to the other portal of the same color. Each time you pass through any portal counts towards these achievements. You will definitely reach 100 before collecting all of the crystals, likely sometime on the third planet. If for some reason you don't, just load up Level 1 of the second planet and go back-and-forth through the portal in this tutorial level.