I currently have an account for the following:
- docs.joomla.org
- magazine.joomla.org
- forum.joomla.org
- extensions.joomla.org
- joomla.org
I hope you dont need an account for each of these
joomla.org
joomla.org/3
api.joomla.org
certification.joomla.org
community.joomla.org
community.joomla.org/joomla-training.html
developer.joomla.org
docs.joomla.org
domains.joomla.org
downloads.joomla.org
extensions.joomla.org
forum.joomla.org
foundation.joomla.org
framework.joomla.org
help.joomla.org
issues.joomla.org
launch.joomla.org
magazine.joomla.org
resources.joomla.org
showcase.joomla.org
tm.joomla.org
update.joomla.org
volunteers.joomla.org
shop.joomla.org
opensourcematters.org
joomlacode.org
identity.joomla.org
taken from https://www.joomla.org/privacy-policy.html/