Unlock all relics slay the spire 2 - how?

There isn't an unlock-all button, and I'd honestly not want one. Relics open up the same way they did in the first game, by playing runs with each character. Wins speed it up but as far as I can tell losses still count toward the progress, so a run where you die on act 2 isn't wasted. Check the compendium to see which ones are still locked for who, that tells you which character to go play. If you really just want everything, people have already shared edited save files, but that kills the fun pretty fast.