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.
Completed the Collection
Found all Pulp Magazines
Found all copies of Gangsters Monthly
Found all Mystery Foxes
Found a Mystery Fox
Performed a wheelie for 3 seconds
Collected 30 vehicles in the Garage
Found all 'Gangsters of the United States' cigarette cards
Took Paulie to a Place of Disrepute
Reached 50mph while driving the Bolt Ace
Found all of the hidden cars
Resisted arrest by the Lost Heaven Police Department
Found a hidden car
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"
Lost the cops after accruing a five star police chase
Completed "Crème de la Crème"
Collected 15 vehicles in the Garage
Completed "You Lucky ..."
Completed "Happy Birthday"
Lockpicked 5 cars on the streets of Lost Heaven and environs
Completed "Bon Appétit"
Completed "Great Deal"
Completed "Visiting Rich People"
Completed "Omerta"
Completed "A Trip to the Country"
Completed "The Saint and the Sinner"
Completed "Better Get Used to It"
Found a Pulp Magazine
Completed "Sarah"
Completed "Fair Play"
Won the race
Completed "Ordinary Routine"
Found a copy of Gangsters Monthly
Completed "Molotov Party"
Found a 'Gangsters of the United States' cigarette card
Completed "Running Man"
Paid a fine to the Lost Heaven Police Department
Completed "An Offer You Can't Refuse"