This prevents any achievements from being obtained on that particular run. Except for some special seeds, inputting a seed will cause the 'no trophies' mark to appear.For example, if you find a Rebirth seed on PC, you can use it on the 3DS version and it will be the same because the 3DS version only has Rebirth. Seeds will be the same on every platform as long as the game version is also the same.
