Spider-Man Web of Shadows

During Act 2, you will receive a mission to destroy 5 Wall Drills and 10 Heavy Tech troops. During this mission, the Heavy Tech troops appear as guards to the drills and stand on the walls next to them. Defeat the Heavy Tech troops that are guarding the drills making sure that you kill them only with wall attacks.

There is no need to worry about not killing the drills during this mission as those groups will continue to appear after the mission through the rest of the act, however, they won't be as clearly marked.

Also, in act 3, you will be facing symbiotic enemies. Almost all of these guys can follow you onto the wall, some will even spawn on the walls. If you haven't gotten it by the end of act 2 simply try and get the enemies to follow you up the walls.

As an alternative if there isn't enough driller baddies spawning for you, purchase the Black Suit's Tendril Attack upgrade "Choke-Explosion." What this does is bring enemies to you with B, and as soon as pressed hold X to choke them to death when they get into your grip.

With this upgrade and the Black Suit on, get on a wall and bring in the smaller enemies toward you and choke them 'till they explode. Bigger enemies cannot be brought to you.