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