If I've a git repository with tags representing the versions of the releases.

How can I get the list of the commits between two tags (with a pretty format if is possible) ?

git log --pretty=oneline tagA...tagB (i.e. three dots)

If you just wanted commits reachable from tagB but not tagA:

git log --pretty=oneline tagA..tagB (i.e. two dots)

or

git log --pretty=oneline ^tagA tagB