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