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