Being a good person in a Grand Theft Auto game can be challenging, but in order to get this trophy/achievement, you will need to do just that. For 24 hours in-game, you will need to go without breaking the law, being wanted, killing anyone, nor harming anyone. Since you can’t really do anything like missions, as most of them involve doing one of the above, the best thing to do is just sit still and do nothing. It’s a good idea to have some fat on CJ for this, just in case.