I'm the lone developer on a project where I'm working across multiple computers, some on VM. After doing a git clone of my repo on gitHub, calls to reflog only show items after the clone. How can I update this new cloned repo to show the full history?
The reflog only shows the history of things you have done to your repository. It is kind of like a local history. This means the first thing you did was clone the repository, and so that is where it starts. I do not believe what you are asking is technically possible.
There are lots of ways to accomplish tasks in Git though. Perhaps you can accomplish your root goal using something other than reflog.