The Capcom Heroes DLC (which was later re-released for free on the PS4 as Dead Rising 4: Frank's Big Package) is a playable game mode where Frank can play as characters that pay homage to other Capcom franchises. They can be unlocked as followed:

Classic Frank (Dead Rising)
Dante (Devil May Cry)
X (Mega Man X)
Ryu (Street Fighter)
Cammy (Street Fighter)
Viewtiful Joe (Viewtiful Joe)
Mecha-Zangief (Marvel Vs. Capcom)
M. Bison (Street Fighter)
Adam the Clown (Dead Rising)
Arthur (Ghosts 'n Goblins)
Bass (Mega Man)
Morrigan (Darkstalkers)
Sissel (Ghost Trick: Phantom Detective)
Zombie Frank (Frank Rising DLC)
Jill Valentine (Resident Evil 3)
Amaterasu (Ōkami)
Akuma (Street Fighter)

In addition, the Shadow variants are a reference to both Shadaloo experiments Shadow and Shadow Lady from the Marvel Vs. Capcom series.

Including DLC for both versions, the Xbox One version of the game has 104 achievements in total to obtain, while the PS4 version only has 58 achievements available.