Get three powerups first in a row, and stay alive throughout the full powerup duration of each, 25 times. That's 75 powerups in total. The fastest/easiest way to do this: play with bots. They're much easier to snatch powerups from because they're not programmed to care about them and you're smarter enough than them to keep the quads and protections from them without dying. The option to play with bots is on the left side of the find matches screen.