MLB The Show 23

To find collections, go to Diamond Dynasty, over to Collect, and select Collections. In here the easiest ones to complete are the Starter Collections. If you go through the tutorials for Diamond Dynasty you probably already completed the one called "Your First Collection." Then there are really easy ones for like 5 Common players or 1 Bat Skin or 5 pieces of Equipment. You can get cards by just playing the game and earning packs or completing challenges in Diamond Dynasty. The bat skins I had to complete that collection came from the Negro Leagues challenges.

You can use to use Auto Select to have it automatically pick the cards out of your inventory that will complete the collection so you don't have to search through them all.

Once you complete a 2nd and 3rd collection after the tutorial one, the achievement will pop.