Here is the full list of all 43 Mafia: Definitive Edition achievements. It takes around 20-25 hours to unlock all of the achievements on Windows.
Performed a wheelie for 3 seconds
Collected 30 vehicles in the Garage
Found all Pulp Magazines
Found all copies of Gangsters Monthly
Found all 'Gangsters of the United States' cigarette cards
Found all of the hidden cars
Found all Mystery Foxes
Completed the Collection
Completed "Fair Play"
Resisted arrest by the Lost Heaven Police Department
Reached 50mph while driving the Bolt Ace
Found a hidden car
Found a Mystery Fox
Completed "The Death of Art"
Completed the game on Easy, Medium, or Hard difficulty
Completed the game on Classic difficulty
Completed "Moonlighting"
Completed "Just For Relaxation"
Completed "Election Campaign"
Collected 15 vehicles in the Garage
Lockpicked 5 cars on the streets of Lost Heaven and environs
Completed "Crème de la Crème"
Found a 'Gangsters of the United States' cigarette card
Completed "You Lucky ..."
Completed "Bon Appétit"
Completed "Happy Birthday"
Completed "Great Deal"
Completed "Visiting Rich People"
Completed "Omerta"
Found a copy of Gangsters Monthly
Completed "A Trip to the Country"
Completed "The Saint and the Sinner"
Lost the cops after accruing a five star police chase
Completed "Better Get Used to It"
Completed "Sarah"
Won the race
Took Paulie to a Place of Disrepute
Completed "Ordinary Routine"
Completed "Molotov Party"
Found a Pulp Magazine
Completed "Running Man"
Paid a fine to the Lost Heaven Police Department
Completed "An Offer You Can't Refuse"