List Commits On A Branch

You can list all commits that have taken place since a branch split off from another branch using git log. You just need to specify a ref range with the originating branch and the branch of interest.

$ git log master..my-feature-branch

That will list all commits on my-feature-branch since it branched off from master.

I like to tighten up the output a bit with a flag:

$ git log master..my-feature-branch --oneline

See man git-log for more details.