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