This achievement is for beating the first boss of the game. To beat shocker, you most attack him when you LB or LB+RB him. He will force you to back up when he shocks the ground.
Second part of the fight is when he jump on top of containers. Pull the one hes on down with spideys web and attack him until he has no health left.
Pretty easy After this boss battle, you will unlock the Seismic Blast ability also earning you another achievement!