This is in the mini game where you have to kick large cans on the side of the screen.
For the achievement you have to get a 12x multiplier. Easy if you know what to do: you have to kick a blue barrel at the top of the pile twice. It is not allowed to drop once. You have to kick after the jump rather quick to hit the 2 top barrels the same time.
You can check out info on all the other achievements in this thread:
Some Guidance