Army of Two (EU)

Requires SSC Pack (600mp from marketplace)

Simply set the game up ranked match SSC Challenge (this can be done with four friends just invite them at the set up screen.) Choose a map, I found warehouse 2 to be best for barrels. Get to the end of the level but do not step on the final panels there is around 10-15 barrels around here that will keep on spawning every 30 secs or so. Set it to 3 rounds as each round has a max 15 minute time limit it will take roughly 3 rounds to get one person the achievement (achievement will pop mid game so switch shooters if someone else needs it or just end the level if everyone is done.)

If the other team are also boosting they should get to the middle of this map before you drop the doll off there is a few barrels scattered around if they keep running back and forth between this part and back as far as they can, just so they aren't standing around doing nothing there is a decent amount of barrels here between 6-8.

EDIT: THIS ACHIEVEMENT IT NO LONGER OBTAINABLE DUE TO SERVER SHUTDOWNS.

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Full credit goes to Pedle Zelnip for this solution.

This solution is taken from the Army of Two achievement list, not the EU version's, and I am merely re-posting this for everyone's benefit.

Please give a reason in the comments if you are going to mark this solution down.

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Carrier 1 is the best map for this. The 2nd section (the one past the two catwalks on either side of the beginning with 3 barrels each) you can do a cycle where you are essentially continually destroying barrels. There's about 5 on the ground, the same 5 on the other side, then proceed to the end and their will be two up above on ledges around the corner. Do the same 2 on the other side, then go back to the start of the area and the first ones will have respawned. Rinse & repeat.

What we did was had one guy (call him P1) doing this area repeatedly. While he was doing this, another (call him P2) was doing the 8 barrels in the beginning area (with the catwalks). And a third (call him P3) was in another area later in the level (our P4 already had the acheivement).

Once P1 got his achievement, P2 then took over destroying barrels in that area. By the time P2 got his, P3 also had gotten his. Note that the achievement pops up immediately mid-match, you don't have to wait until the end of the match for it.

Only took an hour or so for us to get all 4 SSC achievements, and that was with a guy dropping out partway through.