Demon's Souls 10/10
This game has a pretty simple trophy set up. They were basically variations of three trophies. The trophies are collect all miracles/spells/rings/unique weapons, get X weapon upgrade path to max level, and beat X boss. Problem is it's very time consuming requiring multiple playthroughs, AND it's possible to miss an item required for a trophy, which makes you SOL until the next playthrough.
You need to manipulate world tendancies to get all the trophies. You need to get pure black and pure white tendancies in all worlds to get all the hidden weapons and stuff. The game has an online server medium, so other people's actions influence the world tendancy in your game, which means world tendancies are pretty much always neutral, which is useless for you. So you have to play the entire game offline if you want the trophies.
And then there are the multiple playthroughs you need to do. To learn spells, miracles, or to make a certain weapon you need boss souls, of course you only get 1 boss soul in one playthrough since you only fight them once. Most souls had one or two uses, but Maiden Astraea's had FOUR uses. Which means you need at a minimum, to beat the game 3 times, and go about 1/3 through of a fourth playthrough. Each new game plus gets harder than the last to the point were even regular enemies can one shot kill you.
But the single most annoying trophy was getting a weapon to the highest level of the sharp upgrade path, as it requires something called a pure bladestone ore. The final level of an upgrade path requires a pure ore. For half the upgrade paths, you can get one guaranteed pure ore. Killing the Armorspider boss for example rewards you with a pure spiderstone ore. The rest you can get from crystal lizards, and the drop rate isn't too bad, except for the Pure Bladestone.
There are only 2 enemies in the entire game that drop a pure bladestone ore, and they are located at the beginning and end of world 4-2. And they have a fucking 0.5% drop rate. And because of where they are located it would take too long to kill both in one farming run. The fastest way was to kill one and then kill yourself to respawn. One run took about 2 minutes. 2 minutes for a 0.5% drop rate, just let that sink in for a moment. I was lucky, really lucky, it only took me about 4 hours to get one to drop, or about 120 farming runs. I read horror stories online about people doing 300+ farming runs and still no drop.
My estimated time for platinum trophy is 100 hours.