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