This challenge will be something you start on right at the beginning of the game as the first few missions have you fighting Bullymongs. Any type of Bullymong will count, including the most basic Monglets. The first few areas are ideal for hunting down Bullymongs, as they are the most populated with them.
- Rank 1: Kill 25 Bullymongs
- Rank 2: Kill 50 Bullymongs
- Rank 3: Kill 150 Bullymongs
- Rank 4: Kill 300 Bullymongs
- Rank 5: Kill 750 Bullymongs