Here is the full list of all 12 The Living Remain achievements.
Complete The Tutorial
Complete Campaign
Use Medkit For The First Time
Watch Ending Credits
Stab and Kill an Infected Rat
Stab and Kill Five Infected Rats
Upgrade Any Weapon For The First Time
Fully Upgrade Any Weapon
Collect 25 Filaments
Collect 50 Filaments
Find First Special Item
Find All Special Items