This can only be achieved in gang wars mode in multiplayer.
Before the beginning of each round, players have an opportunity to wager on things such as who will be the first player of to get a kill, or get the most melee kills. Continue to wager and pick anyone and hope for the best, it's luck reliant but shouldn't take too long provided you play gang wars.
If you happen to be one of the three players people can bet on, bet on yourself and focus on meeting the requirement to make unlocking this trophy slightly easier.