You must do all the races and win all karate levels
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SA is for the Dreamcast, while SADX is for the GameCube. SADX has the 12 Sonic Game Gear games as unlockables. SADX has 60 missions in it. SADX has a black market in the Chao Garden. SADX allows you to put your chao in the Tiny Chao Garden. SADX awards you for collecting all 130 emblems. SADX has Cream cameos. There are more.
You need 30 emblems in order for a Brown Egg to to be able to be for sale in the Black Market. However, keep in mind that no matter how many emblems you have, one or two egg colors may never appear in the Black Market. Depending on your Chao Garden saved file, the rarity of what eggs appear in you Black Market may differ, and certain colors may never appear at all. If a color you are looking for has never appeared in the Black Market for you, and you know that you have at least the required amount of emblems, you can create a new game with a new Chao Garden saved file.
After your chao has reincarnated twice or more, give it EVERY ANIMAL IN THE GAME and NO CHAOS DRIVES. All of the animals are: PenguinOtterSealPeacockCondorParrotBoarRabbitCheetahTigerGorillaBearSkunkRamRaccoonUnicornDragonPheonixBatSea MonsterSkeleton DogI recommend making a check-list so that you ensure that it works. If you have any difficulties in making a chaos chao, feel free to message me as I have some chaos chao (eight to be exact) so I should be able to help. - Raiwolf
Complete all chao races and chao karate. Complete all challenges on every single level. Complete all racing challenges with all characters. Complete the Dark Story and the Light Story and "End". There might be more but i dont know them...
beat the game with one charicter and have all seven chaos emeralds