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