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