Now for the one that gave me the most trouble obtaining The Superior Spider-man suit, you unlock this suit by completing all 12 combat challenges located at the Comic Stand. Alright you unlock the Hornet suit by completing all 15 races throughout the city. Now you unlock the Ricochet suit by beating Black-Cat in the museum and then you get the Spider-Carnage suit by beating Carnage at the end of the game. Okay now onto the spoiler suits, again if you don't want to possible spoil the game stop reading now and move onto the next paragraph. Now a majority of the other suits are unlocked by completing 'Russian Hideouts' which will appear every chapter the suits gain through this are the Ultimate Comics Spider-man suit, Big Time suit, Scarlet Spider (Kaine) suit, Spider-man 2099 suit, Flipside suit, and the Spider-Armor suit. Alright there is 13 costumes in total, 3 of which you have from the beginning of the game which are The Vigilante suit, The Amazing Spider-man suit, and The Amazing Spider-man 2 suit.
Okay I'm going to put up a warning right now this guide will contain possible spoilers, you have been warned.