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