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