Tails Noir

This achievement took me a few tries to unlock, so I figured I'd post a detailed guide on what worked for me to hopefully help others struggling.

First, I'd recommend deleting your saved data, not just from your console but from everywhere. The first time I did this, I actually got the achievement. To do this is go to the game on your dashboard or in your games and press the button. (Manage game and add-ons > Saved data) NOW, instead of hitting delete all, press on your save and it will ask if you want to delete from your console or from everywhere. Press delete everywhere and that should delete any data from past runs possibly preventing this achievement.
I learned that from a comment by JF117 on the True Connection achievement guide, so credit to them for that. And a huge thank you, assuming this was what I needed to unlock the achievement.

So, in all possible instances when speaking to others, you should say that you're Wallace/Wallace Brotor. There was one instance that I skipped since I knew it wasn't a necessary interaction to progress in the game. I was also careful with dialogue options to some characters because there are some interactions that only give you a "Howard" option. I will list all of that here:

Use Wallace when talking to these NPCs: (In order, so you don't miss any)
Act I:
- Banker
- Johnny
- Renee
- Ingrid
- Clarissa

Act II:
- Superintendent
- Beverly
- Samson

And the achievement should pop after you use Wallace talking to Samson the first introduction.

Extra notes that might be helpful:
- There is an interaction with Mrs. Tilly near the start of Act II where you can introduce yourself as Wallace if you gave the cigars to the kids, but I can confirm that one isn't necessary because I skipped that one.
- I didn't speak with Florence in Act I or Luney at the start of Act II, because those both only give you the option to introduce yourself as Howard.
- I'd recommend not to skip through dialogue when speaking with Louis and Henry in Act II because those both only give you options to say your name is Howard, but you can avoid saying those if you pay attention. With Louis, just press any other dialogue option when that one shows up until you're done talking with him. With Henry, you have to not be too nice to him. If you pick the options that call him bud or you're too nice to him, the game will make you tell him that your name is Howard by giving you one 'goodbye' option. I would assume these void the achievement, so better to be safe than sorry.

EDIT: Credit to InkyPaws and Flame Sama in the comments, both confirm that being nice and honest with Henry does not void the achievement.

Hope this helped! :)