This achievement can be done quite easily with the use of gobblegums. But, let's first go over the changes to the Moon Map from the original Black Ops. The volume of the announcement of pending breach can barely be heard or be silent unless you are running in that area currently. And, having your helmet on or off doesn't affect the volume either. What happened to us was the last excavator came down and no one heard anything until the breach was complete. On our 2nd attempt, we got Tunnel 11 on round 7, Biodome on round 15, Tunnel 11 on round 20 (We let this one continue to breach), and Tunnel 6 on round 21 (While the prior tunnel is still trying to breach) TRICKY.
You can complete this one easily with 2 to 4 players.
Gobblegums: the only mandatory gum is that at least 2 players have several POWER VACUUMS. Other gums can be anything that will give players perks: Perkaholic, Soda Fountain, On the House, Rain Drops, etc. Another useful gum is the Crate Power.
Training Areas: The Hacker and others can run in the Biodome, One player has to run on the Moon outside by the Teleporter. This is key because since you may not hear the announcement, this player can see all 3 excavators and will know immediately when the breach is in process cause the excavator will start spinning and have blinking lights.
So, start the game like you normally would. Buy doors, hack doors, & hack box (try to get each player with some form of Ray Gun because you Will Not need to Pack A Punch the entire game. Also, don't even bother opening the tunnel 11 side as it is just a waste of time hacking doors.
On round 10 - 12, the fun starts. Have one player get the Power Vacuum gumball. If you have never used this gum all I can say is OHH MY GOD! Droppings will be laying everywhere, Nukes, 2X, Death Machines, Insta Kills, And I do mean everywhere, you can easily look forward and see 10 dropping in front of you, and your teammates are seeing the same thing in their areas. Just keep running picking these up and the rounds will all end in a minute or two and the amount of points you get is ridiculous.
This gumball activates immediately and lasts 4 rounds. So, after 2 or 3 rounds, the next player needs to hit the gumball machine 3 times each round to get their Power Vacuum. The goal is make sure you have at least one power vacuum active at all times. Keep repeating this process to speed through the rounds. I've done this to the upper round 30, carrying only a ray gun and non packed a punch guns and still had no issues staying alive.
Lastly, stopping the breaches. Whenever, the breach starts, the hacker can easily make it to the start room solo. I found the easiest route is to run out to the teleporter and fall off the side so you land in the pyramid room. Run up the stairs and to the starting room and hack the one of the three consoles with the green blinking light. With all of the nukes going off, you shouldn't see a single zombie while enroute. The only thing you need to be cautious about is running in to the Space Man.
ENJOY and don't forget to dashboard at the end to save them damn gums!