Of the top of my head, any resolution to adopt or amend or rescind an Owners Corporation rule requires a special resolution. Deciding to have more than seven members of the Executive Committee requires a special resolution.
I think deciding to dissolve the entire OC might be an unopposed resolution but that has not really come up as an issue where I am.
Download the latest version of the Unit Titles (Management) Act and do a text search for ‘special’, ‘unanimous’ and ‘unopposed’ and you could quickly compile your own list.