Whilst you can attempt to do this achievement the same time as working on some others, I suggest you do this alone because the other achievements require one of you to re-host matches under certain categories and because one person will be hosting and another person will be getting invites or setting up controllers, this can be frustrating.
You can either do this achievement with additional controllers or via XBox Live with a partner/s. You can also do both methods in which you and a partner on XBox Live assign a 2nd controller each, or have 1 person on XBox Live by themselves and another with 2 additional controllers plugged in, giving 3 players.
If you are planning to host the match, simply select XBox Live, then Player Match. Assign the the controllers on the Local Players page if you are adding them in. Choose Battle and Create the Match on the Classic Map in the Battle Game Mode.
Make sure the maximum amount of players that can join is 4 and set the maximum amount of wins to 9. All the other settings do not matter.
You do not have to change anything for the Power-Up Settings neither.
Once the match is up, invite your partner/s if you are doing this via XBox Live. When the match begins, the players who are losing simply need to move for a moment and then they can plant a bomb to commit suicide.
Rinse and repeat this for the 9 Rounds and the winning player should have 9/25 wins. Restart the match with the same settings and keep going until you get the achievement for winning 25 Rounds.
Finally swap roles and repeat the process if you are doing this with a partner/s.