The Spyro remastered trilogy was pretty easy to plat. I suppose easier since I 100% them all as a kid, but that would be a good plat that is challenging enough but not overly so, and not a time sink.
Dark Souls, believe it or not, is also not a terribly difficult platinum, at least compared to other games of the system. It took a few playthroughs, but once you know how to play those games, just becomes an exercise in repetition and grinding.