Here is the full list of all 13 Strip Card Duel achievements.
Take your first 5 steps
You've officially become a prisoner of Sadista prison
Congratulation on unlocked Lauren
Congratulation on unlocked Fernalda
Congratulation on unlocked Bhuwan
A new character is now unlockable
You've proved yourself as a worthy fighter
Well fought, my good sir! You're now the undisputed Champion of the Arena
Not many able to make it this far
Only true hero can claim this title
You're an evil man who only live for your selfish desires
You've found the true happy ending for you
It was a bad end