Here is the full list of all 12 Rebirth:Beware of Mr.Wang achievements.
Full CG unlock
Reached the Observer ending
Reached the Nuts marriage ending
Reached the Nuts provider ending
Unlock all human world recalls
Reached the Twins ending
Reached the Mianmian ending
Reached the Mint ending
Unlock all heaven memories
Unlock the Celestial Backyard Portal
Handing toilet paper to man in black
Reached the uncle ending