I got the platinum recently on the ps4 as version.
- Social Butterfly needs to be done with only one character. I would recommend to use the female character, since she has more night time social links.
- A pair of wildcards can be also done with the bad ending in your second run. You can actually just skip till december 31, get the bad ending and the trophy after the credits end. After the tutorial you don't have to go to tartarus at all for this, since you never will fight nyx, meaning you can just skip literally everything, leaving you only the story related bosses.