Super Boss Waves are special levels in Garden Ops. The 5th and 10th wave has the slot machine that picks what the boss wave is going to be - when all three are matched as the same boss type you fight a Super Boss Wave of that boss. Completing three of these will unlock this achievement. Unfortunately, because it's random you could need to play many rounds of Garden Ops. It doesn't appear that there is a requirement for what type of Garden Ops (local, online, single player, etc.).