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