Access Arcade by scrolling down
on any of the open Tents, and selecting Arcade. The most forgiving is Arena 1.
Pass the first 20 traps by smashing 5 barrels apiece and this achievement is yours.
Where possible take your time. When you have time for a breather, such as rockets above and below, use this it to hide under the platforms between attacks. You'll soon learn trap combo patterns too, such as when a bird is in play don't chase after it, let it come to you.