I don't know if this has already been answered, but I couldn't find an answer for my problem. Example scenario is something like this:
Developer 1 works on project A
Developer 2 works on project B
Both developers work on project C (where shared libraries reside)
Developer 1 wants to generate a log from commits of project A and project C (commits made by him)
I have seen custom scripts making this but I want to know if there's a way to do this using Git (windows) only.
Git itself has no convenient way to do what you want. There is definitely a set of functions which, if used correctly, can do what you want. Fortunately few git extensions already implement the functionality.
Git subtree is a part of git distribution package and allows to map another project repo into your main project repo. It allows mapping histories between the main and project and the sub-projects. It seems to be a good candidate to solving your issues.
It is implemented as a very simple script and has some disadvantages. For example, the mapping information is not passed through the clones. This had been solved with 'git-subrepo' script. So, this could be a second candidate for you.
Git submodules do not provide history mapping and most likely would be difficult to use in your case.