Completed, All Levels with Rank S, All Missions, All Chaos Emeralds And Sol Emeralds And Full Sound Test Unlocked, All Cutscenes Unlocked, All Vehicles Upgraded And Sea Chart Complete Map
You can get older ones even like the pi 3,4 for cheap, but they don't play gamecube, Wii etc very well. Be warned they use a Linux os, which you need to load onto a micro SD card yourself. You can find pre built images like "retro-pie" online free tho which makes it easy to setup.