I used some of the answers and found one that fit my case ( make sure all tasks are in the release branch).
Other methods works as well but I found that they might add lines that I do not need, like merge commits that add no value.
git fetch
git log origin/master..origin/release-1.1 --oneline --no-merges
or you can compare your current with master
git fetch
git log origin/master..HEAD --oneline --no-merges
git fetch
is there to make sure you are using updated info.
In this way each commit will be on a line and you can copy/paste that into an text editor and start comparing the tasks with the commits that will be merged.