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