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