The easiest path towards starting a credit history is getting a postpaid cell phone plan. It could also be an option to ask your bank for a low-credit credit card, or you can apply for one in department stores like Falabella or Exito.
But the best advice I can give you, although it will take some time, is to start saving. You can keep a fixed portion of your salary in your savings account or apply for a trust and deposit a fixed amount each month without withdrawing any of that money.
As soon as the bank notices your saving habit they will contact you to offer you a line of credit.