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