I have two small glitches for your list:
Wrong program icon
The program file “Sins of a Solar Empire Rebellion.EXE” have the Diplomacy icon on it, instead of the Rebellion one, more info: https://forums.sinsofasolarempire.com/420883
Wrong Achievements description on Steam pages
The following achievements have a wrong description text on Steam's Personal Achievements page:
Toaster Roaster
Says: “Win the game by yourself against at least three Hard AI players.”
Should say: “Win the game by yourself against at least two Hard AI players.”
Comp Stomper
Says: “Win the game by yourself against at least four Hard AI players.”
Should say: “Win the game by yourself against at least three Hard AI players.”