Here is the full list of all 49 Mad Max achievements. It takes around 50-60 hours to unlock all of the achievements on Windows.
Complete all non-repeating challenges
Loot all Scavenging Locations
Collect all History Relics
Complete Act 05
Complete at least one race at every Death Run Location
Successfully complete a Death Run with every Archangel
Complete a Death Run in legendary time with every Archangel
Defeat an enemy vehicle with every Archangel
Complete a Time Bomb Death Run
Complete Act 04
Own the best V6 and V8 Engines
Complete all Wasteland Missions
Complete Act 03
Be airborne in a vehicle for 4 seconds or more and land without dying
Build all projects in all strongholds
Clear all minefields
Destroy all scarecrows
Take out all Scrotus snipers
Fly the balloon at every Vantage Outpost
Complete all optional objectives in all camps
Clear all threat in Pink Eye's territory
Take down all Scrotus camps
Collect all body colors
Collect all hood ornaments
Reduce threat to 0 in the Knit Sack region around Pink Eye's Stronghold
Clear all threat in Gutgash's territory
Have 10,000 scrap in your inventory
Fully upgrade Max
Reach Road Warrior legend rank
Have 5,000 scrap in your inventory
Reduce threat to 0 in the Parch Moon region around Gutgash's Stronghold
Clear all threat in Jeet's territory
Build two projects in Pink Eye's Stronghold
Complete Act 02
Build two projects in Gutgash's Stronghold
Complete a Barrel Bash Death Run
Complete a Scatter Death Run
Complete a Death Run in an Archangel
Take down a Top Dog camp
Reduce threat to 0 in the Balefire Flatland region around Jeet's Stronghold
Eat a meal of maggots
Build two projects in Jeet's Stronghold
Complete the Dinki-Di Wasteland Mission
Give water to a wanderer
Reach a new legend rank
Complete Act 01
Travel 650 car lengths on foot
Drive the Magnum Opus off a Wasteland jump
Travel 1300 car lengths in a vehicle