Here is the full list of all 42 Assetto Corsa trophies - there are 26 bronze, 13 silver, 2 gold and 1 platinum.
A true sim racer
Complete all the GT Extreme series
Complete 5 laps without damage
First broken engine
Complete a race without damages
Complete one GT Extreme series
Complete all the GT series
Achieve a gold medal on all the special events
Achieve a gold medal on all the drift events
Achieve a silver medal on all the drift events
Reach level 50 in drift mode
Achieve 50 combos in drift mode
Complete all the series with gold medals
Complete one GT series
Complete the Formula series
Achieve a gold medal on all the hotlap events
Achieve a silver medal on all the hotlap events
Complete the Hypercars series
Achieve a gold medal on all the time attack events
Achieve a silver medal on all the time attack events
Complete all the Trofeo Advanced series
Complete one Trofeo Advanced series
Complete all the Trofeo series
First pole position
Achieve a gold medal on all the race events
Achieve a silver medal on all the race events
Complete a lap at the Nordschleife under 7:30
Drive for two hours in a session
Drive your first lap at the Nordschleife
Complete one Trofeo series
Complete all the Intermediate series
Complete a drift in drift mode
Complete one Intermediate series
Complete all the Novice series
Complete 10 laps in time attack
Complete one Novice series
Complete a lap in race mode
Reach 300 Km/h
Receive your first penalty
Complete a lap in an online race
Complete a lap in hotlap mode
Complete a lap in time attack mode