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