Batman greatest/favourite comic book feats
The first that comes to my mind is when he and Aquaman alone assaulted the JLA Watchtower to stop Triumph, Ray II, and the other telepath girl.Triumph was able to use magnetic energy to give himself superhuman strenght, speed, invulnerability, he also possess superhuman senses and other Magneto-like powers.
Batman and AM teleported in the watchtower, and Bat take out Ray using a blackout bomb of the Doctor Midnite and cross punched in the face Ray, saying he's a smart guy and he should to stay out of the fight.
Then proceeded into saying Triumph to surrend.Now that was impressive.