Yes, we're all pushing in the same branch (not called master, we have one branch per version (usually we have one branch that's the current version deployed in production and the development branch)). To group up commits for review, we add in the commit message the Jira issue number and Jira will keep a list of all commits through Bitbucket. Bitbucket supports PRs, but I don't think it's ever been used here.

I can gather that the way we're using is not the most usual ;).