To get this one you need to choose all the bad options in the playthrough (ones that will give you the separating icon):
I had to do a full replay of ch3 to get this after my first playthrough was to get the strong bond
WARNING: There is a small chance that if you went with all "good" choices in previous chapters, you might have trouble meeting the requirements for this achievement (same goes for making bad choices and getting the Tyler ending). This, plus Tyler ending and both bond achievements, are extremely vague and this guide is going based on how I unlocked the achievement after 2.5 playthroughs of Chapter 3.
-Fail the panic attack app on your phone
-Don’t tell Eddy you were the one that killed your mom (this seems to be the other important factor)
-Tell Michael you are too different
-You can break open the chest or entered the code to the chest (Leo) - just don’t solve all the main (3) puzzles
And most important, Choose to keep your memory that Mary-Anne was going to kill you.
(It’s possible there are some extra steps in there, but I don’t want to take any away and have you not get the achievement and do another playthrough. Choosing the left memory and lying to Eddy seem to be most important though) These should get you the ending where Alyson is at the house at the end. Go into Mary-Anne’s old room (room on first floor next to the phone) and sit at the desk, then choose to finish the story.
Achievement pops after some dialogue.
Thank you Erinx212 for the help