Battle for the Pacific

There is no need to play Deathmatch to get this achievement - it makes getting it much longer than it has to be.

To get this achievement you do need 4 players (at least starting the game, all 4 do not have to finish). Designate who in your group will be getting the achievement and start a Ranked Elimination game - then have the three who are not getting the achievement drop grenades at their feet three times each.

Repeat the process for all four members of your group and you will each have the achievement in less than 10 minutes.

Set up a ranked elimination match with your boosting party. The person who is going for the achievement just stand there. The other 3 people just throw frags at your feet and kill yourself. Do this until you cant re-spawn anymore. The match will end. Do this for everyone in your group.

Get 4 people (thats the min amount of players you need). Set up a ranked deathmatch. The person who is going for the achievement just stand there. The other 3 people just throw frags at your feet and kill youself. Do this untill you cant re-spawn anymore. then once everyone cant re-spawn the ranked deathmatch will end and the player will get an achievement. Rinse and repeat for everyone else who needs the achievement