Within a period less then twenty years he trained and mastered most known martial arts
.
Within same period honed his body to near super-human.
Mastermind scientist.
A disguise master.
Only needs 15 minutes to come up with a plan to defeat anyone.
Extreme iron will, enough to get rid off drug addiction within a week spending solitary in the cave.
An unending bank account.
The ability to make everyone else around him dumber.
Adept in interrogation techniques.
Master acrobat.
Master of Stealth.
Expert marksman.
Expert Mechanic and Vehicular Driver.
Multi-lingual.
Escapologist.
Master Tactician and Strategist.
Worlds greatest Detective.
Studied Biology, Technology, Mathematics, Physics, Mythology, Geography, & History.
Gained degrees in Criminal Science, Forensics, Computer Science, Chemistry and Engineering. Biology, Physics, Advanced Chemistry, and Technology
Mastered Diverse Environmental Training, Security Systems, and illusion/sleight of hand.
Learned Forensic Sciences, Medical Sciences, Expanded Computer and Engineering Sciences. Advanced New Development in Forensic and Medical Science.
Ventriloquism.
Can fly planes and space ships.
And then theres all his toys and gadgets....
But I still think if they randomly met in an alley. Batman chasing a baddy and stumbles upon the turtles, and the turtles sees a dark clad guy with a cape. (Mandatory crossover fight ensues) I think the turtles would have the upper hand if they had blitzed him.
Batman would probably win in the end because... He's Batman, he have beaten up guys like Superman and Spawn, barely breaking a sweat, cause "I am Vengeance, I am the night. I. AM. BATMAN!"