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