This achievement can be easily done on the map Hoth.
In this Video I show you multiple spots to do this the most important thing is to make short work of the AT-ST rounds.
You should not run into to much trouble just so long as you are playing CO-OP and making short work out of the Ground units.
With all of the taking into consideration it it more important than anything not to die because you are still playing on master difficulty and it is not a "walk in the park"
Star Wars Battlefront - Master Survival Guide - Hoth