I've included a video for those who prefer a visual guide of the achievement.
There's not much I can really help you with that hasn't been said in the above solution. Be fast when it comes to the spiders. Don't hold the ball, the ball should be constantly shooting at the spiders. Practice aiming your shots so you know when to shoot and where your ball will go. It's annoying because you either drain the ball because it's so easy here, or you don't do it fast enough. Good luck.Youtube Video Credit: