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