In order to obtain this achievement, you must be on the defenders side of the map on either the CQB Training, Three Kingdoms Casino, Theater, Presidio, Comcast Event, or Convention Center maps. You must successfully disarm the bomb after it has been planted at either site A or B. The match will end immediately after the bomb has been disarmed, rinse and repeat 10 times.
Going for this achievement legitimately can be a bit tricky, not to mention the community for this game is not what it used to be. I suggest boosting this, so you will need to find 5 others besides yourself. The maps I recommend are CQB Training or Presidio, as those are two of the smallest maps available.
I hope this solution helped! Leave a comment letting me know if there is any room for improvement! Thanks.