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.
Return ring to Reggie
Acquire 30 traits
Acquire 10 armor sets
Acquire 200,000 scrap
Acquire 15 weapon mods
Defeat the Totem Father
Meet Andrew Ford
Meet the Pan Rebel Leader
Return the Swamp Guardian's heart to the Undying King
Meet the Swamp Queen
Upgrade any weapon to +20
Meet the Undying King
Meet the Labyrinth Keeper
Defeat Singe
Acquire 100,000 scrap
Meet the Root Mother
Defeat the Ent
Defeat the Claviger
Upgrade a boss weapon to 5
Acquire 5 armor sets
Defeat the Dreamer
Defeat the Ravager
Acquire 20 traits
Acquire 5 weapon mods
Acquire 50,000 scrap
Defeat the Undying King
Defeat Ixillis XV
Defeat 100 special enemies
Upgrade any weapon to +10
Acquire 10 traits
Craft a weapon using material from a defeated world boss
Upgrade Dragon Heart
Defeat a world boss in single player without taking damage
Upgrade any trait to 20
Acquire Mudtooth's pocket watch
Return coin to Ace
Upgrade any trait to 10
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