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