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