If you got a score on a feat, you can call out others to try to improve on this.
If someone calls you out, improve on their score and the trophy is yours.
Friend route: If you have any friends playing the game, just ask them to send you a call-out on a feat you can beat.
Solo route: If you have another account on your PS4 that you are friends with, you could also have that account start the game and then send a call-out to your main account. This idea comes from
Doc_Chopper and he has tested it, this works.
If you want to know how to call someone out, see my guide here: