Here is the full list of all 43 Mafia: Definitive Edition achievements worth 1,000 gamerscore.
Completed "The Death of Art"
Completed the game on Easy, Medium, or Hard difficulty
Completed "Moonlighting"
Completed "Just For Relaxation"
Found a Mystery Fox
Collected 30 vehicles in the Garage
Found all of the hidden cars
Found a hidden car
Resisted arrest by the Lost Heaven Police Department
Completed "Election Campaign"
Lost the cops after accruing a five star police chase
Completed "Crème de la Crème"
Completed "You Lucky ..."
Found a copy of Gangsters Monthly
Completed "Happy Birthday"
Collected 15 vehicles in the Garage
Completed "Bon Appétit"
Completed "Great Deal"
Completed "Visiting Rich People"
Completed "Omerta"
Reached 50mph while driving the Bolt Ace
Performed a wheelie for 3 seconds
Completed "A Trip to the Country"
Completed "The Saint and the Sinner"
Lockpicked 5 cars on the streets of Lost Heaven and environs
Paid a fine to the Lost Heaven Police Department
Completed "Better Get Used to It"
Found a 'Gangsters of the United States' cigarette card
Found a Pulp Magazine
Completed "Sarah"
Completed "Fair Play"
Won the race
Completed "Ordinary Routine"
Completed "Molotov Party"
Completed "Running Man"
Completed "An Offer You Can't Refuse"
Find all Pulp Magazines
Find all copies of Gangsters Monthly
Find all 'Gangsters of the United States' cigarette cards
Find all Mystery Foxes
Complete the Collection
Take Paulie to a Place of Disrepute
Complete the game on Classic difficulty