If you prefer to watch videos instead of reading the guide, feel free to do so. There is a video that covers every trophy on my YouTube channel. If you'd like and subscribe or even become a member, it would mean a lot to this channel!
Solving 100 puzzles basically means completing the entire game. Most of the trophy requirements are pretty obvious but we have to keep an eye on Pillar Perfection. If we don't unlock it during this step, we have to redo the entire game.
After solving all puzzles and watching the credits, we need to take care of some miscelleanous trophies. All in all this step takes roughly 10 minutes.