Here is the full list of all 50 The Descendant achievements.
You completed Episode 5: "Ultimatum"
When seeking Donnie, your route was pretty much flawless.
The final janitor of Ark-01 refused to let anyone else die.
You prevented every avoidable descendant death across all episodes of THE DESCENDANT.
They made their choices. You made yours.
You saw Donnie begin his last day on the job.
You completed Episode 4: "Cerberus"
You helped Mia find sanctuary.
You had a most curious conversation.
If at first you don't succeed, try try try try again.
You found a way to travel in style.
You survived your encounter with a disgruntled colleague.
You helped Donnie and Randolph discover a new path.
You discovered the clues as to how the inferno was caused.
You helped Mia to survive the inferno.
You completed Episode 3: "What Lies Beneath"
You refused to be boxed in.
You gained Level 4 Security Clearance.
You gained Level 3 Security Clearance.
You gained Level 2 Security Clearance.
Sometimes, you can be too clean.
You saved a life by administering emergency first aid.
...helps the medicine go down.
The world may be about to end, but at least you're not alone.
You saw Donnie express his right to protest.
You’ve enabled everyone to breathe a sigh of relief.
You successfully helped Donnie accomplish his task.
You successfully escaped a sticky situation on your first try.
You successfully helped Randolph accomplish his task.
You helped Randolph without making a single mistake.
You reached your destination, but the journey is far from over.
Your route to the tower includes a significant diversion.
Your chilled approach to problem-solving is admirable.
You saw someone get sent to their doom.
You completed Episode 1: "Aftermath"
You successfully averted a crisis.
You successfully averted a crisis in less than ten minutes.
You found an ID card on your way to solving a crisis.
You chose Mia’s area of expertise.
As Donnie, you gained access to Ark-01.
You triggered the explosion on your first try.
You started playing Episode 1: "Aftermath"
You chose to lie to Silas.
You were THIS close to averting a crisis… or six. Maybe next time.
You found artifacts of a previous civilization.
You found all the possessions of a missing person.
You made Donnie check everything possible while in the Descendant Chambers of both Arks.
The final janitor of Ark-01 became a threat to the descendants.
The final janitor of Ark-01 removed a threat to the descendants.
You unlocked every achievement across all episodes of THE DESCENDANT.