You know there's just so many fun things to do in stellaris that could count as achievements either because they're difficult or are fun references. I've decided that for the sake of fun that I'd start this thread to collect ideas for such Mini-chievements and start off with one of my own. Feel free to add your own.
Paved Paradise
Starting from life seeded turn your homeworld into a ecumenopolis
Paved Paradise
Starting from life seeded turn your homeworld into a ecumenopolis