Board Thread:Questions and Answers/@comment-24520051-20170603194337/@comment-28125426-20170712170016

Okay...

He doesn't start taking heads until Bloodstorm.
 * Three confirmed headless corpses found by GCPD.
 * Donato Cardona and his three goons. (While we only see Cardona beheaded, it is implied all vampires are now executed properly.)
 * Manny the Shark (Assumed only)
 * Mansion massacre (8 assumed and only 1 depicted.)
 * Gordon's squad kills three, only one depicted decapitation.
 * Joker's gang (15 - assumed only)

Crimson Mist:
 * Penguin and gang (9 in total but only 5 technically depicted)
 * Riddler (confirmed by Gordon)
 * Scarecrow (depicted)
 * Poison Ivy (confirmed by Gordon)
 * Black Mask and gang (5 depicted)
 * Amygdala (depicted)
 * Mad Hatter (assumed)
 * Mr. Zsasz (assumed)
 * Unidentified Arkham inmates (Two depicted)
 * Alfred (depicted)

Total depicted = 18 Total confirmed = 5 Combined total = 23 Total assumed = 35 Grand total = 58