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