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