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