Characters - The Binding of Isaac: Rebirth Wiki Guide - IGN
The Binding of Isaac: Rebirth - The Binding of Isaac: Repentance DLC Trophy Guide • PSNProfiles.com
Various endings of The Binding of Isaac. | Download Table
I created a table which shows the items you can unlock by killing different bosses with different characters. You can just print it out and check the items you've already unlocked. :
Unlockables - The Binding of Isaac: Rebirth Wiki Guide - IGN
Unlockable characters in The Binding of Isaac. | Download Table
The Binding of Isaac Rebirth: Character Completion Marks - GamePretty
Steam Community :: Guide :: How to unlock every Character in Rebirth/AB/AB+/Repentance
The Binding of Isaac: Rebirth - The Binding of Isaac: Repentance DLC Trophy Guide • PSNProfiles.com