This Trophy is Missable
While Missable, it will most likely be obtained throughout playing if you aim to get a sweep bonus.
A Sweep bonus is during Shuffle time after a battle, you are generally given 1 turn to pick a card from the selection of cards. Early game there can be anywhere from 3-5 cards give out during Shuffle time. A Sweep bonus is when you manage to grab all the cards offered until there's none left, easy ways to do this is to grab cards that have a '1 or 2 more' above the card itself so you have another turn to pick up more cards. The cards that tend to have 1 or 2 more though tend to be negative cards, such as half experience or money for that battle. Early game this isn't really a big deal so i suggest working on this in the first 2 Dungeons of the game (That's where mine popped) as the further you get into the game, the more cards are up for sale and it's harder to sweep.
Another thing to note is that once you get a sweep bonus you gain another 1-2 turns ontop of your regular 1 turn during the next shuffle time, making it easier to 'chain' sweep bonuses as you will start off with 2-3 turns already. If you get a chain going i suggest keep grabbing everything you can that will increase your turns so you don't run out. I managed to chain 8 together just before my Trophy popped making it much simpler, while you may be grabbing negative cards or ones you already have though it's well worth it.