Here is a guide I used off PStrophies. All credit goes to Lemmerman for the guide, and dzachec for his tip and I can confirm this does work.
On the Silence ship, you have to make it to the end without being checkpointed. You must keep a Silent in sight at all times (River's eyesight, not the screen), and when you reach the generator, trigger it when a Silent is on screen and not starting to fade away. I lost so many times because it was vanishing when I thought I was safe.
there is way if u fail.
simply quit the game using XMB & when u start game again, u ll be back at last checkpoint - beginning of silent section.
i did it myself when i failed & trophy still popped