Dice Poker is a minigame that can be played on many various space stations. You need to only win 10 games to unlock this achievement. The rules of this game are NOT to be confused with Liar's Dice from Witcher, nor are they exactly like poker's. Dice Poker has a large element of RNG but it is possible to save scum by winning, leaving a station and then returning to it. Exiting via the dashboard will prevent the game from delivering a loss.
Quoted from Wikipedia. https://en.m.wikipedia.org/wiki/Poker_dice
The classic poker dice game is played with 5 dice and two or more players. Each player has a total of 3 rolls and the ability to hold dice in between rolls. After the three rolls, the best hand wins.
In most variations, a straight only counts as a Bust (high-card). A Straight is less probable than a Full House, so, if counted, it should rank above a Full House, though tradition usually ranks it below Full House, as in card poker. Neither a "flush" nor a "straight flush" is a possible hand, due to the lack of suits on the dice.
In some rules, only a straight to a King is called a Straight, while a straight to an Ace is called (somewhat incorrectly) a Flush. Each one has an exact probability of 120 / 7776. Under these rules, a Straight beats a Full House (unlike in card poker, but correctly reflecting its probability) but does not beat a Four of a Kind (incorrectly reflecting its lower probability). A Flush beats a Four of a Kind (as in card poker, and correctly reflecting its lower probability).