Here is the full list of all 50 RIDE achievements.
Complete 20 online races
Complete a race in Split Screen game mode
Reach a total of 50 bikes in your collection
Enroll one of your friends in the Motoclub
Complete your first online race
Complete an Online Championship
Reach a total of 25 bikes in your collection
Win a Gold medal in each Elite Trophy of the World Tour
Reach the 1st position of the Ranking of the World Tour
Win a gold medal in a Endurance event of the World Tour
Enter the Free Camera menu from the pause of any race
Buy a Triumph bike
Buy a KTM bike
Reach a total of 20 bikes in your collection
Buy an EBR Bike
Buy an Energica bike or a Lightning bike
Reach the 10th position of the Ranking of the World Tour
Reach 280 Km/h (174 mph) in any game mode
Buy a Yamaha bike
Reach a total of 15 bikes in your collection
Buy a BMW bike
Buy a Honda bike
Reach the 25th position of the Ranking of the World Tour
Win a Bronze medal in 4 different Elite Trophies of the World Tour
Buy a Bimota bike
Reach a total of 10 bikes in your collection
Buy a Suzuki bike
Reach the 50th position of the Ranking of the World Tour
Change the title of your rider
Change one of the gears of your rider
Buy an Aprilia bike
Reach a total of 5 bikes in your collection
Reach the 100th position of the Ranking of the World Tour
Win a gold medal in a Team Race event of the World Tour
Buy a Kawasaki bike
Buy a new component for one of your bike
Enter the bike settings menu
Pull a continous wheelie for 8 seconds in any game mode
Reach the 200th position of the Ranking of the World Tour
Buy a MV Agusta bike
Win a gold medal in a Drag Race event of the World Tour
Reach a balance of 100,000 credits
Pull a stoppie for 2 seconds in any game mode
Win a gold medal in a Track Day event of the World Tour
Use a Rewind in any game mode
Buy a Ducati bike
Win a gold medal in a Time Attack event of the World Tour
Reach the 300th position of the Ranking of the World Tour
Enter the World Tour game mode
Complete a valid lap in Time Trial game mode