I just want to remember you guys that in Arkham Knight Batman defeated all this villains in just one night

Arkham Knight

APC Lieutenants

Arkham Knight's Militia

Azrael (Optional)

Blackfire's Cult

Deacon Blackfire

Deathstroke

Dollotrons

Firefly

Harley Quinn

Harley's Gang

Harley's Thugs

Man-Bat (Escapes on October 31st)

Officer JT Wicker

Penguin

The Penguin's Henchmen

Poison Ivy (Deceased; Released)

Professor Pyg

Raymond Underhill

The Riddler

Riddler Thugs

Rioters

Scarecrow

Scarecrow's Henchmen

Simon Stagg

Thugs

Two-Face

Two-Face's Gang

There is even a Maximum Security West Wing (The Season of Infamy DLC) for other villains:

Iron Heights Prisoners

Killer Croc

Mad Hatter

Ra's al Ghul (Optional)

Two Rebel League of Assassins Ninjas (Optional)

Warden Ranken

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Not talking about the other games where he did the same thing.