Here is the full list of all 21 CARRION achievements. It takes around 5-6 hours to unlock all of the achievements on Windows.
Nourish yourself
Breach the BSL-4 Research Ward
Breach the Military Junkyard
Breach the Uranium Mines
Breach the Hazardous Waste Landfill
Breach the Botanical Gardens
Breach the Leviathan Reef Base
Breach the Relith Science HQ
Breach the Bridge of the Leviathan Reef Base
Breach the Nuclear Power Plant
Breach the Armored Warfare Facility
Breach the Bunker
Carry on, my wayward son
Harvest your first ripe juicy head
Gain access to 1 Containment Unit
Gain access to 3 Containment Units
Gain access to 6 Containment Units
Gain access to all 9 Containment Units
Relive the First Flashback Sequence
Relive the Second Flashback Sequence
Relive the Final Flashback Sequence