Full list of all 50 Remnant: From the Ashes achievements. It takes around 35-40 hours to unlock all of the achievements in the base game on Windows.
The base game contains 40 achievements, and there are 2 DLC packs containing 10 achievements.
Acquire 10 armor sets
Acquire 200,000 scrap
Defeat a world boss in single player without taking damage
Defeat the Ravager
Acquire 5 armor sets
Acquire 15 weapon mods
Return the Swamp Guardian's heart to the Undying King
Defeat the Claviger
Acquire 100,000 scrap
Return ring to Reggie
Upgrade any weapon to +20
Acquire 30 traits
Upgrade any trait to 20
Upgrade a boss weapon to 5
Acquire 50,000 scrap
Defeat the Dreamer
Acquire 20 traits
Meet Andrew Ford
Defeat the Totem Father
Meet the Pan Rebel Leader
Defeat Ixillis XV
Upgrade any weapon to +10
Acquire 5 weapon mods
Upgrade Dragon Heart
Meet the Swamp Queen
Defeat the Undying King
Meet the Undying King
Return coin to Ace
Defeat the Ent
Acquire 10 traits
Meet the Labyrinth Keeper
Craft a weapon using material from a defeated world boss
Defeat Singe
Defeat 100 special enemies
Acquire Mudtooth's pocket watch
Upgrade any trait to 10
Meet the Root Mother
Activate the Ward 13 World Stone
Upgrade first weapon
Acquire first trait
Purchase 40 Armor Skins
Defeat 10 Bosses in a row in Survival Mode
Purchase 15 Armor Skins
Defeat 5 Bosses in a row in Survival Mode
Listen to all the Recordings in Ward Prime
Defeat the Final Boss