For the "Cowabunga It Is" achievement, you must complete a 250 hit combo. The way I did it was towards the end of Stage 5 and with one of the mouser robots, and this way was an incredibly braindead way of doing it.
I did it with April's basic combo. If you hold up and right on the joystick, (which causes April to do her tilt attack and reposition herself towards the corner) you can literally juggle the robot until you get the achievement. Naturally, you have to be in the corner for maximum efficiency.
At first, I wanted to see if the counter surpassed 999...and it does. The dive kicks were extra, just to see if it worked.
![](https://i.ytimg.com/vi/Ijv4zPQRPKw/maxresdefault.jpg)