Here is the full list of all 24 ATV Renegades achievements worth 1,000 gamerscore.
Beat initial Best Lap times in all variations of Thailand
Obtained 1st place in all variations of Thailand (Quick Race, 6 racers, 3 laps, extreme cpu skill)
Obtained 1st & 2nd place in all variations of Thailand (2P, 6 racers, 3 laps, extreme cpu skill)
Beat initial Best Lap times in all variations of USA
Obtained 1st place in all variations of USA (Quick Race, 6 racers, 3 laps, extreme cpu skill)
Obtained 1st & 2nd place in all variations of USA (2P, 6 racers, 3 laps, extreme cpu skill)
Beat initial Best Lap times in all variations of Russia
Obtained 1st & 2nd place in all variations of Russia (2P, 6 racers, 3 laps, extreme cpu skill)
Obtained 1st place in all variations of Russia (Quick Race, 6 racers, 3 laps, extreme cpu skill)
Finished 1st overall in tour 6
Finished 1st overall in tour 5
Beat initial Best Lap times in all variations of Canada
Obtained 1st place in all variations of Canada (Quick Race, 6 racers, 3 laps, extreme cpu skill)
Obtained 1st & 2nd place in all variations of Canada (2P, 6 racers, 3 laps, extreme cpu skill)
Finished 1st overall in tour 4
Finished 1st overall in tour 3
Finished 1st overall in tour 2
Beat initial Best Lap times in all variations of England
Obtained 1st place in all variations of England (Quick Race, 6 racers, 3 laps, extreme cpu skill)
Obtained 1st & 2nd place in all variations of England (2P, 6 racers, 3 laps, extreme cpu skill)
Beat initial Best Lap times in all variations of Mexico
Obtained 1st place in all variations of Mexico (Quick Race, 6 racers, 3 laps, extreme cpu skill)
Obtained 1st & 2nd place in all variations of Mexico (2P, 6 racers, 3 laps, extreme cpu skill)
Finished 1st overall in tour 1