Easy solution is load up the Communication Nexus drop zone, select Iron Man as your hero. Immediately fly past all the enemies to the door and interact with it to open the next room. Now once you're in there activate your Hulkbuster ultimate ability and start smashing the turbines. You should be able to destroy all of them before your ultimate runs out. However if you still need to destroy the last turbine either spam rockets on it or use your Unibeam ability until it's destroyed and you're done.
Easy 5 stars on Challenge IV difficulty.