Friendship Rules Achievement
Revive someone from "Fight for Your Life!" that is on your friends list.This achievement can be done in local split-screen or online with a friend. You need to make sure you have the person you are reviving on your friends list prior to launching the game, as it seems to be finnicky if you find someone and add them while you're playing with them. Have the other person stand still and take damage (removing the shield will speed this up) and then hold when they are down on the ground to revive them.