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