score:4
As members of the Church we believe there is revelation that can be shared, and revelation that is so personal it cannot. Each member of the church can receive personal revelation. It is not restricted to the leadership. As with the individual, so it is with the leadership of the church. They receive revelation that is strictly for them, and others that can be shared with the general population.
For my answer, I will go with the latter, the revelation that is allowed to be shared as a whole.
I do not know, nor do I think there could be a single list of the revelations of The Church of Jesus Christ of Latter-day Saints. There are too many. We believe the Heavens are open and revelation comes to those who seek and are worthy to receive.
The church is becoming more transparent in its history and other aspects. You will find many previously unpublished revelations (and more) of Joseph Smith by viewing the Joseph Smith Papers. Many historical accounts can be found at the LDS History website.
If you care more about more recent revelations. General Conference is a good place to start. Every 6 months the church meets as a whole and the sermons are recorded and posted for all to review and study. Within the General Conference addresses, new temples are announced, policy changes are announced (Missionary age change), etc.
There is also the Mormon Newsroom, which publishes church statements which often clarify a position the church takes, or releases new statements.
The First Presidency will send letters to the Bishops to read to the general congregations. These contain direction, policy change, and so forth. They are only accessible if you are a member of the church and have an LDS Account and the accessibility is limited by church calling as well as membership. Occasionally they are published on the LDS Church News Website
In summary, there is no "one list to rule them all" but the revelations are not held in secret.
Upvote:3
I'm going to assume you're asking about the letters read in Sacrament meetings about policy changes. Like staples mentioned in his answer, the only way to get an easy to navigate list of those letters is with access to the "Leader and Clerk Resources" in an LDS account. LDS members have to be in certain leadership callings to access that. However, that doesn't mean you can't find the letters. The easiest way is to go to lds.org or mormonnewsroom.org and type something like "first presidency letters" into the search bar. That returns a random list that's terrible to navigate (on both sites), but it's still something. Not all the letters are about policy, so it's best if you know what you're looking for.
If you want to find if there is a letter on a specific topic, you can go to the Topics tab in mormonnewsroom.org and look through a desired topic.