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