A lot easier than it may seem. Holocards seem a bit rare at the beginning of the game but using raritanium to upgrade your weapons will add to the chance of them appearing and completing sets of holocards will increase your chances of both raritanium and holocards appearing (it will tell you after completing sets). After these get to snowballing, you'll rack up lots of cards in no time. Also trade in your duplicates for new cards (and I suggest completing the ones that are closest to being done first). You'll probably have this near the ending of your first playthrough, and if by chance you don't, you'll definitely have it soon after starting your second playthrough.
Side note: I'm not sure if the RYNO cards count for this achievement or not as I had them all before I finished my standard set, but they're not too difficult to gather either. There are plenty of videos of their locations
AgnosticMeatball has confirmed that RYNO cards do count for this trophy. Thanks for that.