I made an easier Big daddy save for everyone, because it took so long and you had to do so many things before you could get the trophy. So now all you have to do is go over to the teddy bear and collect the last big daddy serum. No password required. I have tried my save on a blank account and can confirm that it works, the trophy pops after collecting the last serum.
HOPE I HELPED
Thank you for taking the time to look at my save.
MY SAVE :