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