I’ve only seen guides for for the truth, for love, for science, and forever. How do we get the in love with love achievement/ending? And how do we unlock the ??? Section in the achievement section?

Hii

Right now I'm seeing this from my phone (sadly, I don't have the game here but in my laptop, and that thing is charging right now), but I think I remember some data that will help you. 

I tried to play every final of the game when I got it, and that unlocked me the "???" section, and I think the achievement "In love with love" also gets unlocked when you play that section. (I'm not really sure of the Last part, so when I play again, I'll post the correct answer here) 

Hope this helps! <3