There is no logic built in Trello to do 3 out of 5 or if these 3 are checked or those 2.
However, if you want to create a CRITICAL checklist, you could use something like this.
I believe the criteria is either the list is completed aka all items checked or incomplete aka some items unchecked.
The alternative is to have a checklist for just the 3 items and have the other items in another checklist.
To achieve what you want you will probably need to use the http request to an endpoint that will handle that for you.