Wolfenstein

Just play through this level in Multiplayer. Be good and help pushing your team. When the team wins in which you are playing you will get the achivement.

Before game ends (minimum a minute before) you can switch to the better team, but I wouldn't do that.

Why bother playing through a regular match and stressing yourself out when you could easily just host a match up with a friend and kick anybody else? Simply kill your friend and wait out the full time and bam easy achievement! Also if you are planning to boost up all the way to level 50 don't even bother as most boosting matches take place on this map and you will win plenty of rounds where you won't have to worry, but if you aren't like I said earlier just host it up have a friend join get the kill and relax.