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
Return the Swamp Guardian's heart to the Undying King
Upgrade any weapon to +20
Defeat a world boss in single player without taking damage
Acquire 200,000 scrap
Return coin to Ace
Acquire 100,000 scrap
Defeat the Totem Father
Return ring to Reggie
Acquire 15 weapon mods
Acquire 5 armor sets
Defeat the Dreamer
Acquire 30 traits
Meet Andrew Ford
Defeat the Ravager
Meet the Pan Rebel Leader
Defeat the Undying King
Defeat Ixillis XV
Acquire 50,000 scrap
Defeat Singe
Acquire Mudtooth's pocket watch
Acquire 20 traits
Meet the Swamp Queen
Defeat 100 special enemies
Upgrade a boss weapon to 5
Meet the Undying King
Defeat the Claviger
Acquire 5 weapon mods
Craft a weapon using material from a defeated world boss
Upgrade any weapon to +10
Meet the Labyrinth Keeper
Defeat the Ent
Acquire 10 traits
Activate the Ward 13 World Stone
Upgrade any trait to 20
Upgrade Dragon Heart
Meet the Root Mother
Upgrade any trait to 10
Upgrade first weapon
Acquire first trait
Purchase 40 Armor Skins
Purchase 15 Armor Skins
Defeat 10 Bosses in a row in Survival Mode
Defeat 5 Bosses in a row in Survival Mode
Listen to all the Recordings in Ward Prime
Defeat the Final Boss