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