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