I experienced better results during Bolt's boss battle with Calico. Once you inflict enough damage on him, he will go to his healing machine (two on the level). Attack him while he is healing by repeatedly pressing X (3-5 times), then attack him with Bolt's laser vision (LB) and hold the button. He will push you away. Wait until he is healing again, rinse and repeat. The combo count will continue despite being hit and the achievement will unlock when your count reaches 30 (during the fight).
Edit: "Go straight from hitting "X" to hitting "LB" and DO NOT land on the ground, it will take about 30 seconds". Special thanks to Im the Lorax
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