This achievement can be unlocked in either single-player or split-screen ops.
Simply wait until wave 5, 10, 15, or 20, and a slot machine should show up on the screen. If all of the slots have a boss's face on them, a super boss wave will start. Simply survive and defeat the boss and the achievement will pop. This can be fairly tricky if you usually play on crazy difficulty, but it should be easy to unlock on the easy difficulty.