Monster Hunter Rise

For most hunters, this will come naturally by progressing thru the game at their own pace, after completing 50 quests in the Citadel, as the description says. For those who want to grind this out as soon as possible, reach MR3 in the Sunbreak Expansion until you unlock a quest called "Soft or Spotty?" which requires you to slay a total of 15 Gowngoats or Boggi (small monsters). If you choose to go this route, I would suggest NOT eating a meal before each quest, and save your meal tickets/zenny/points for the more important large monster hunts. The quest should take a matter a minutes; repeat until the achievement unlocks. Happy hunting!