Here is the full list of all 38 The Bad Son achievements.
You have discovered a terrible secret
You have managed to survive the monkeys
You have repaired the weapon
You have read Malachai's poem
You are a kitten lover
Now you can navigate
You have met a brainless neighbor
You know what happened in the mountains
The rebels love you
You stay quiet like a puffer fish
Welcome to the District School Board
Reached the level of working class hero
You got Dollarwoman to hand you a hefty check
Crazylogic has no logic
You cheated on the very painful Dolores
You guessed the riddle
Got news about the next event called by the authorities
Did you hear about the rebel leader's dog
You have known part of Malachai's past
The exposure of the cult of death has left you frozen
You met the most excellent local butler
Helped the Pied Piper keep up with the musical enchantment
The phoenix is now your friend
You managed to escape from the prison of banking and speculation
You reached the sacred mountains
You have known the sad pedagogy
You trampled on Shoewoman's house
Unraveled the mystery of the Derrigtown Aquarium
You have reached an alliance with Yetison
You have witnessed the burial of the criminal
You have seen the end of Speculator
You escaped the undertaker's trap
You have rejected the death mortgage
You have decided what to do with Impossiblemum
You managed to find Chickengame
You’ve found out what happens to the taxi driver
Did you get the medicine?
You have fed the monkey