Hi @Luca_O, welcome to the Asana Community Forum!
I agree with both options shared by @IvanStaykov! If you are interested, you can also have a look at this integration: New reminder integration: RemindoBot - now in beta!. It was not developed by Asana but you can ask questions to the creator in that thread 
Lastly, we have a product request to have this feature in Asana. I suggest you to upvote here: Set a reminder to tasks
I hope this helps!