Same situation here. Samus achievement hasn't unlocked. Easily counted over 50 seperately, in a row, with and without jumping, making sure the shot overlaps the player sprite during dash... I figured out how to remove the headcrab well after easily 200 of these attacks dodged. Tried in a wave, in a single game, exiting, losing after getting various markers... I don't know how many energy attacks from the sqoids I've dodged, but it must be in the thousands overall by now...