Here is the full list of all 6 Anodyne achievements. It takes around 8-10 hours to unlock all of the achievements on Windows.
You found all 48 cards!
You finished the game with over 37 cards, all the health and broom upgrades!
You 100%'d and finished the game in under 3 hours!
You defeated Briar!
You activated the windmill!
You found the broom!