
Originally Posted by
Drageuth
In one of the levels (can't remember the name of it at the moment) there's a room that will pretty much infinitely spawn spiders once you learn the trick. It still takes a little bit and can be quite boring, but it's a helluva lot easier than running through random areas trying to find enemies to kill. You can find a video of it on Youtube if you look up the name of the trophy, which is escaping me at the moment.
Also, for the "Ride 666 Miles" one, like Tanthias says...
... use a rubber band. I got into the middle of a wide open space in the desert, snapped a band on my controller holding the left stick all the way to the left, and he ran around in a circle for about ten minutes until the trophy popped. I don't recommend actually watching the screen, though, or you'll get dizzy and pass out. Motherfucker turns pretty sharply.