Search Times Square behind the red bleachers, on the glass.
Black Costume
Complete the game with a 100% completion.
Classic Spider-Man Costume
Download and start the 'Rhino Challenge' DLC.
Classic Spiderman suit
Complete all petty crimes.
Comic Books
When you have collected the indicated amount of pages which are scattered around Manhattan the corresponding full issue of Spider-Man comic will become available to read.
1st Black Cat:
Collect 125 Pages
1st Gwen Stacy:
Collect 350 Pages
1st Iguana:
Collect 250 Pages
1st Lizard:
Collect 15 Pages
1st Rhino:
Collect 50 Pages
1st Scorpion:
Collect 80 Pages
1st Smythe:
Collect 500 Pages
1st Spider-Man:
Collect 5 Pages
Modern Lizard:
Collect 30 Pages
Vs. Vermin:
Collect 175 Pages
Cross Species Costume
Complete the game on any difficulty setting.
Easy XP and Tech points
You will earn 2,000 XP and 150 Tech Points for each kill when you battle the S-01 in 'Chapter 1: Oscorp Is Your Friend'. Each kill takes under 4 minutes and you can keep defeating the S-01 as many times as you want to quickly level up and max out your available skills.
Future Foundation Suit
Search behind the gas station store in a small alley. One block right of north bridge.
Negative Zone Suit
Search on top of the Beenox building, second building inward from Brooklyn Bridge.
Original Suit (No Belt)
When the game begins, you will have this suit. Go to Peter's apartment and check for alternate costumes. The original suit will be waiting in the closet.
Sam Raimi Trilogy - Classic Suit
When you register any of the game's DLC (including any pre-order code you may have received) and you will unlock this suit in Peter's apartment.
Scarlet Spider (2012) Costume
Find the fountain which is located near the middle of Central Park. Then, go north until you reach the middle bridge, which is directly at the center of Central Park. If you look on the right side of the bridge you will see a Spider-Man emblem. When you take a picture of the emblem the Scarlet Spider (2012) costume will become unlocked.