I finally got this achievement after finally getting into an Oddball game on the right map with the right players.
Also with a fair amount of begging to the enemy team in the first round via Xbox chat asking for help.
The map I got the achievement on is Solitude. It has the close quarters you need and ability to hide. As a bonus, it has an overshield that spawns.
Unfortunately, some players will be over zealous in wanting you dead. In my experience of the failed attempts prior to this, the enemy would just nade you or would back away if you charged towards them.
As the oddball is a 2 hit kill, you have to get very lucky with this.