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