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