This happens both in beta and live. I use the bunny biscuit to start Easter, unlock all 20 eggs, and no achievement. I do use Frozen Cookie, but even loading the game without it doesn't unlock the achievement. My beta upgrades are at 100% so I know I'm not missing any there. Live I'm collecting them again now after my latest reset. Anyone have any idea why this would happen or how to fix it? Or should I just use Game.Win to unlock it manually?