The Amazing Spiderman - Guide to unlock all sketches
If you are looking to find all the sketches of The Amazing Spider-man and unlock this achievement / trophy:
Amazing Spider-Man - Unlock all sketches.
this guide can help you to succeed.How to unlock all sketches
In The Amazing Spider-man, sketches are unlocked by completing story missions, photographing all enemies (including bosses), collecting collectibles, and completing side missions.
For the sketches related to the collectibles, consult the dedicated guide that shows their position.
For side missions you have to find them knowing that they are marked with a green camera icon on the free map of Manhattan. Finally, for the photos of the enemies you can consult the following video that shows which are the enemies to photograph and where you can find them.