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