Speaking of the World Tourer achievement, the tracks that seem to come up missing for most people—and the tracks I, myself, missed—were the drag strips. You have to make one pass on each length of each strip, too. At least one of the strips has more than two length versions available to run, I believe. The different ovals you should get done during the course of the different speedway events, but the drag strips don’t get any attention at all in the career or event lists, and will have to be done online, in arcade mode/single race, or in split-screen.
Furthermore, one of those stupid speedway events might prove especially annoying; the Japanese Tuner event. In that event, you’ll be pitted against most of the “Unicorns”, including a few that are true powerhouses. The 0-300 Top Secret Toyota Supra, I think? Plus Mine’s Skylines and some others. The only cars you have access to that can do that event legitimately are vastly inferior, and I’m not sure how doable it actually is after all the time I’ve spent NOT replaying that particular event. Your best bet for that event is to either turn off the restrictions and take some overpowered car of your own, and/or turn the AI’s capability way down. If you pay close attention to the Hyundai you might be facing in that event, you can even catch a glimpse of how the game isn’t held to the same limits that you are; the Hyundai in that event is rated higher than you can legitimately tune yours, if I’m not mistaken.
For those “1000 miles in X car(s)” title/badges for Chevy/Corvette, Ford/Mustang, BMW, MINI, etc, I found it most enjoyable to drive them in such a way that I wasn’t in the same exact car for too long, just to keep things extra-interesting. Not only would I swap from running a Corvette to running a Mustang, but I found a few examples of each that I liked/wanted multiples of in different paintjobs, and even ran them with different setups. Red and black '65 Mustang for a while, then blue and silver C2 Corvette for a while…then yellow and black '65 'Stang…then red and white C2 'Vette…then green and cream/off-white '65 'Stang…then fully-tuned, mean-as-hell black-as-moonless-night C2 'Vette…etc, etc. Also, about the Mustang-specific 1000 rewards, it can be ANY Mustang, from ANY dealer; Shelby, Saleen, Ford—doesn’t matter, so long as the model family is noted as “Mustang.” And for the Corvettes, the racing models work just as well as the production/street models, and the longer/higher-paying/higher-experience races you can do in them will also help raise money and level the manufacturer, so you might get close to manufacturer affinity level 50 while doing Chevy/Corvette titles/badges. I had at least five different MINIs, too, all with different setups and paintjobs, maybe even bodykits and rims. Full assortment of Pontiac Firebirds and GTOs…aside from the newer ones that I don’t care so much for.
When you get around to doing the drifting stuff, be sure to take a good look around for tuning ideas here on the forums. A lot of folks have posted quick and easy setup formulas you can use to make just about anything capable of getting the big scoring drift laps… Plenty have posted drift-specific tuning setups on their storefronts, too, but I don’t think I’d suggest getting one; you’re better off tuning the car yourself, that way you don’t have to worry about the setup being locked, or bothering some to get it unlocked, so you can change and adjust the setup or parts on the car freely yourself. I did the big drift lap things with that tricked-out HKS Mitsubishi Lancer, myself. Took it carefully around Fujimi Kaido a time or two. Once you get used to the track and the car, and drill it into yourself to leap at every chance to drift it and try to link some together, it should come pretty easily… When I got right down to it, it actually only took me about two or three laps to make it happen. Be sure you’ve got ABS, TCS, and STM all off before you go for it. Making it easy to light up the back tires also makes it easy to get the back end kicked out, or so it seemed to me. Mind your throttle, brake, and steering, and you should be fine, with a little practice. You can also use that Lancer for the other drift-related titles/badges/achievements, but I think I took a kitted-out Toyota Trueno and tried to actually “learn” how to drift on one of the little parking-lot test track layouts to get those.
I guess it’s actually pointless to bring it up at this point, but due to the different rewards you get for doing the different events, there are actually some events you really want to do before others. Looking back on the game, it seems like it would be most efficient to do the events that give driver level rewards first, then random-reward events, then follow up with the affinity and credit reward events. That said, given how different events pay out different amounts of experience naturally anyway, a low-level event that has even a +100% driver level bonus may not be so important in respect to driver level boost compared to a late-game R1 event that has some other reward bonus… Oh well! Who really cares that much about efficiency, anyway?! We came here to drive fast and turn in different directions at different times, sometimes leaving black marks!
My Gold subscription ran out about a week ago, so I may or may not be of any help when it comes to helping with some other achievements… I may take a look later on tonight and see if I can still access the storefronts and auction house; I forget whether or not Gold was only needed to race online or if it was necessary for the other functions as well.