Right, read this in full because this may be utterly awful advice and I'll at least say why...
I used to use this website... I THINK it was this one, but it's been the better part of a decade so I'm not sure. I recall that it was a four-letter url, and I got this on my second try, so it...
This. I readily second this. Uncharted still gives up some goods for trophy-related goals. GTA IV simply turned off trophies when you used cheats, but I like this way better. Kind of how they did it in Goldeneye, if my semi-reliable brain is remembering correctly.