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