Full list of all 60 Remnant II achievements. It takes around 60-80 hours to unlock all of the achievements in the base game on Windows.
The base game contains 50 achievements, and there are 2 DLC packs containing 10 achievements.
Listen to All of Mudtooth's Stories
Discover a Blood Moon Room
Acquire 10 Relics
Upgrade a Standard Weapon to +20
Acquire 20 Melee Weapons
Acquire 30 Guns
Play a Secret Song on the Water Harp
Craft 15 Weapon Mods
Upgrade a Weapon Mutator to +10
Acquire 10 Melee Weapons
Acquire 15 Guns
Acquire 100,000 Scrap
Acquire 20 traits
Defeat the Fae Imposter
Upgrade a Boss Weapon to +10
Defeat Many Faces
Acquire the Max Number of Trait Points
Acquire 50,000 Scrap
Acquire a World Boss's Alternate Reward
Defeat Guardian of N'Erud
Defeat a Boss in Single-Player Without Taking Any Damage
Defeat the Final Boss
Obtain 10 Traits
Craft an Item at the Blood Moon Altar
Defeat the Ravager
Defeat 25 Aberrations
Meet the Flautist
Receive an Alignment Reading from Meidra
Discover Leto's Stash
Slot a Second Archetype
Obtain a Secret Archetype
Upgrade a Standard Weapon to +10
Defeat Tal'Ratha
Defeat 10 Aberrations
Reach Level 10 on Any Archetype
Upgrade a Boss Weapon to +5
Defeat 100 Special Enemies
Meet the Custodian
Craft a Boss Weapon
Defeat the Labyrinth Boss
Defeat the Nightweaver
Defeat a World Boss
Upgrade Any Trait to 10
Upgrade Relic Capacity
Obtain an Item From the Nightweaver's Web
Meet Nimue
Craft a Non-Starter Weapon Mod
Obtain a Non-Starter Trait
Choose Your First Archetype
Defeat the Root Mantis