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