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