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