Full list of all 85 Mafia III achievements. It takes around 50-60 hours to unlock all of the achievements in the base game on Windows.
The base game contains 55 achievements, and there are 3 DLC packs containing 30 achievements.
You survived the drive into Sinclair Parish
You helped MJ and Roxy get the Witnesses free
You captured Slim Beaumont
You helped Irma, Jeremiah, and Christian
Reached the Max Herbalism level
Fully upgraded the Grow House
Sold a single batch of weed for $10,000 or more
Destroyed 10 of Slim's re-election billboards
Killed 30 enemies using Proximity Mines
Successfully triggered 10 Vehicle Traps
You investigated the scene
You survived the trip to Boicherot's
You got a hot tip on a loose nuke
You helped Donovan end Connor Aldridge
You secured the nuke
Knocked out 30 people with the Dart Gun
Placed an unconscious person in the trunk of a car
Killed 50 enemies using the Hartmann 7.62mm and wearing the Party Animal outfit
Completed all Bounty Hunting assignments
Killed 30 Enemies Using Sniper Support
You investigated the cult's activities at Sammy's
You met Bonnie Harless
Investigated the 3 "Places of Darkness"
You killed Bonnie Harless
Began Sammy's Renovation
Protected Sammy's from the Dixie Mafia
Fully renovated Sammy's
Killed 4 enemies using Slow-Mo Shooting 10 Times
Killed 20 enemies using Throwing Knives
Drove a distance of 50 km in the Samson Harrier