Here is the full list of all 22 DUCATI - there are 90th Anniversary achievements.
Collect all the bikes in the game
Unlock the "Great Victories" category in Historic Tour mode
Reach a total of 30 bikes in your collection
Unlock the "Modern Era" category in Historic Tour mode
Reach a total of 20 bikes in your collection
Unlock the "2000s" category in Historic Tour mode
Unlock the "90s" category in Historic Tour mode
Reach a total of 15 bikes in your collection
Reach a total of 10 bikes in your collection
Unlock the "80s" category in Historic Tour mode
Win a race with Pro physics
Reach first place in an event in the Historic Tour mode
Reach a total of 5 bikes in your collection
Unlock the "70s" category in Historic Tour mode
Complete 20 multiplayer races
Complete 10 multiplayer races
Pull a continuous wheelie for 8 seconds in any game mode
Unlock a Title
Pull a stoppie for 2 seconds in any game mode
Complete your first multiplayer race
Reach at least the third place in all the events in the Historic Tour mode
Unlock all Titles