It's currently buggy, you need to have anal 4+ skill to unlock it. The fix will roll out with another update!
What bugs exactly are you talking about? I can look into it if you have found anything! But apart from the above, the main menu Gallery upper tab issue, and one or two very minor things, there should be no serious bugs in the game now.
You should be able to unlock them all by just playing, talking with people, and checking stuff. The two you've mentioned are the only ones that are currently exclusive (you need to either load the game or roll back to get both). Ultimately, I plan to have all entries 1) at least one of their own renders and 2) at least two unlocking instances. Point 1 will be corrected with the upcoming tech/content update, and point 2 is one of those things that is a result of the game still being developed and will be corrected once the game is a bit longer!