Play any of the campaigns, and on the first level when given a choice between the left or right paths, take the right path(bank right). Position your ship on the left side of the screen in the middle and fight the enemies until you see a pie that says “MBG” on it. Grab it.
On the second level, take the right path again and do the same thing. You will see another pie that says “MBG” on it that also drops a lot of 1UPS. Grab this and complete the level. You should unlock this achievement and the “1UP Yours” achievement