A simple achievement, requiring that you play the game during the yearly Easter period in April. Make a playlist containing only the mode Egg Plus Plus, plug in up to 4 remotes, or as many you can possibly mash
with, and hop into your playlist. Progress is cumulative between all remotes; not just the one your main profile is signed into, meaning if you can mash consistently enough, you can get roughly just under 400 eggs per minute.
One last note, this will not stack with the normal egg achievements. I waited to unlock the 10k one to see if they would unlock together, and they did not. So while Easter is live, the 3 normal egg achievements technically become discontinued for a little while (unless they are still in a different mode, but i wouldn't recommend doing that as it would be a colossal waste of time).