For this achievement, you have to collect one of each card type (Emerald, Sapphire, Ruby, Diamond, Pink Diamond, Galaxy Opal and new with this year's game: Dark Matter -- this is ranked from easiest to acquire to hardest to acquire).
As of the time of writing (September 2020), this achievement is currently unobtainable (unless you spend thousands of dollars on packs in the first few weeks on packs) until later on in the year when they add Galaxy Opal and Dark Matter cards into MyTeam mode via purchasable packs and rewards. As the year goes on, Galaxy Opal and Dark Matter cards (and Diamond / Pink Diamond cards) will become more easily accessible in the game mode.
In 2K20, by the end of the season they gave away multiple free cards on this level via the locker codes system. If you follow their official Twitter account, they will probably do the same this year (so keep an eye out for one).