to hide title from backend you can/need to set up a custom post-type that has that setting.
at your “register_post_type” function change/replace/add this line: 'supports' => array('revisions'),
then only revisions shows at backend, no title, no exerpt, wysiwyg, … , leave blank to show nothing except your acf
of course you can use any needed value out of this instead or additional to revisions (list is not complete, look at wp reference) array( 'title', 'editor', 'author', 'thumbnail', 'excerpt', 'comments' )
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