The last trophy I needed was Knight's Honor (collect all rare weapons), and to get it I had to do a third playthrough up to the point where I can get to the Giant Blacksmith, and I had to kill Sif along the way since his soul is required for one of the last two weapons I needed. So I'm speeding through the playthrough, using shortcuts to skip to the bosses of the two bells without any of that in between stuff, and then somehow I forgot to actually kill Sif and made it all the way to the Giant Blacksmith.
So then I had to trek all the way back to Darkroot Garden from Anor Londo. At least it's a pretty straight shot with all the shortcuts unlocked, but its a lot of running to get there. I left my last bonfire in Anor Londo so that I could just homeward bone back after I was done with Sif. But then I stupidly got killed by the Forest Hunter NPCs on my way there, so I had to trek all the way back to Darkroot Garden again. Luckily that was the last of my troubles, and I was finally able to get the last trophy.
Platinum Get!
Now I just have to find something else to keep me busy until I get my copy of Dark Souls 2.