This is my daily task.
Sometimes one of your three opponents in pvp will say revenge.
There was an earlier report of revenge battles not counting for the revenge task, but explore would. I am not on Console so no clue about the status of that.
suppose to look like this, thats how it looks at pc/mobile since 2.0 (also u can see a new thing ‘Rival’ that you should be getting along with 2.0 pvp, rival u get by attacking same person repeatedly)
I can confirm, explore works for this.