So, just completed Leech Mode on Hard by collecting all talismans. Well, it was...hard. Because the more you proceed on collecting talismans, the less you can use special weapons like the SMG. So in the end you will be forced with a character owning all talismans plus a key, and the other with all slot taken by talismans and a simple gun.
Anyway, I think there's a bug going on. I killed EVERYTHING in the facility, including respawned enemies in all locations (like the kitchen, the corridor on 2F, the outside corridor on 2f, the room where you take the key, the room with tiger, eagle etc puzzle) because I saw there's a trophy for it, so since I collected all talismans and I had some ammo left...why not?
Anyway the trophy didn't pop. I googled and it seems a common bug, other people cleaned the mini-game both with Magnum and SMG, still nothing. One dude claimed he got it while randomly shooting in the crow room.
So be aware, if you go for it, maybe there's a bug. For me, I don't care, the mini-game was really hard and crappy, but at least now I have infinite ammo for all weapons, in the case one day I'll want to play the game again.
I swore I defeated all the bosses I could with only Rebecca and the trophy didn't pop. Ugh.
Otherwise had a blast with this again.
Stupid question: did you kill the first leech you meet on the train? Because maybe that one counts as boss, maybe you just turn out triggering the cutscene and avoiding the fight.