Here is the full list of all 24 Soul Gambler achievements. It takes around 2-3 hours to unlock all of the achievements on Windows.
You are starting to get sick of this hospital
...but not in control
Save ?? and question ??
Can be how a story ends
Sometimes is what remains in the end
Be smarter than a cheater
Officially an outlaw
Solve a problem using violence
Show that you know how to handle a woman
Celebrate the end!
Do you believe in them?
Nothing else to lose
You are no ladiesman, are you?
It's impossible to escape from your fate
Never give money to a stranger
Maybe...
Meet someone known on the other side of the world
Don't forget your toothbrush
Better aim a good conduct
This suicide is not from the squad
Proof of your investigative abilities
Now you do know a bit more about the game's secrets
Finish your work on time
Cut your hand and make the pact