Rock Band 3

For any of the road challenges just play within your comfort level of difficulty. I would say anything above Medium will suffice. Some tips on specific "types" of spade achievements:
*Hit full overdrive as much as possible: some times I would purposely miss more overdrive phrases while my current drive was running as to not keep it going and wasting more future phrases.
*Overdrive Overdose: every time you hit 50% on the overdrive bar, hit it.
*Overdrive Chain: get your overdrive up to about 75%, wait 10 seconds, then hit it so that you will probably be coming up on another 1 or 2 overdrive phrases that will keep your overdrive going longer.
*Overdrive Streak: same concept as the Chain with regards to maintaining a long overdrive period...but you also need to streak your notes the whole time during it. No misses!
*Streakmania: there are a few different types of streaks but basically just try to maintain your streaks as much as possible.
*All for One: If you miss a note or two just do your best to not worry about them and get back on track.