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