Sneak King

What you need to do for this achievement is once you sneak up behind someone that is hungry for some burger king and press the "A" button.A meter will pop up will different kinds of flourishes. The very bottom is regular next one up is flourish 1 next flourish 2 and then flourish 3 at the very top. just press a as the red line is going up or down. Once it gets to very the top press the "A" button again and you will preform a level 3 and unlock this achievement.