Ok, before I tell you how you can do that let answer a you a question, which you probably thinking in your head that why can't you just set the reminder?
Well, I think that people set the reminder for certain things that if it (reminder in the phone) reminds ones you can remember that for whole day or until the thing is done. But there are some things that is not very important but kind of important as well. So for those kind of things you need a constant reminder, because if it reminds you once you might forget it.
How to do it?
This is for Android users, I'm sure there must be a way for iPhone users too.
1. Go to the settings.
2. Click on the "Lock screen" icon.
3. Scroll down and click on "Owner information".
4. You will see a pop up, write what ever you want to be reminded.
5. Make sure you check the "Show owner info on lock screen." then hit OK.
Can you write a full list of things?
Well, I think it would be better if you write the full list of things on the Memo and just write "Check the list of things on the memo" that will do that job.