Answer by Kieran for Get a list of all Git commits, including the 'lost' ones

When I tackle this issue I use the following command:

git reflog |  awk '{ print $1 }' | xargs gitk

This lets me visualise recent commits which have become headless.

I have this wrapped up in a script helper called ~/bin/git-reflog-gitk.

Edit: - my git-reflog-gitk wrapper is redundant - as you can now call gitk --reflog directly