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