Either on (at least) your 2nd playthrough or in Hard (or greater) difficulty, conquer the fierce battle at the Spiritcrest Rayfalke without using any items!
This is proof that you've battled a wide swath of enemies. By the way, the more of the same enemy you defeat, the more likely that enemy becomes to drop equipment with skills attached. Time for some population control!
This is proof that at least one Lord of the Land has reached Blessing Level 20. Even when they pass to the stars, they find it hard to abandon those over whom they watch. It seems some remnant of their blessing remains even after you finish the game.
This is proof that you've collected all 36 anomalous orbs. You've poked around in every nook and cranny, you've laughed, you've cried, you've questioned your assumptions... But you made it!