Here is the full list of all 18 Beckett achievements.
Someone lives
Cold shower
Warm bath
Do you exist?
Death in the family
What's done is done
The mind loses focus
Someone dies
They were right
Fine dining for all the family
Remember what was
Live, die, repeat
Hands up if you're sane
Amy loved Beckett
The truth about the boy
Orders from The City
Homeless Issues
Absurdity of existence