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