Deployment

This is probably the toughest achievement in the game. You need to win a match without ever capturing any systems with , so just avoid capture points entirely. Your score is based on kills, assists (which you get if you contribute to a kill, even though it's not a team based game), kills on sentries (little assisting bots that one of the classes can send out), and then extra points if you pick up the pink extra point boost. So obviously kills give you the most score but damage everyone because you'll get assists too. 

For which class to use, it comes down to personal prefence but I'd recommend either Cyclops or Sniper. If you've got good aim then you should be able to do this with the Sniper pretty easily. My aim wasn't so good so I used the Cyclops which, as the game says, is great for beginners. Boost your damage and HP with your perks, and make sure you've got the lower difficulty gun selected in the class editor. 

During the game, since you're not allowed to capture systems, be very aware of what the systems in each room are doing. The ones with the medical cross give heath to whoever has the system, so no real issue there. The main threat is a system with a skull on the top. If you're in the same room as this system, you'll take significant damage over time, so avoid this room entirely. Never go in it, no matter what. 

Typically the bots fight in the same 1-2 rooms. What's best to do is steal kills and clean up kills after fights. This is why the Cyclops and Sniper are really good, since you can get kills from a distance quickly. Aside from just hunting enemies though, always look for boosts and grab them when you see them. The armor and healing are particularly useful, but there's also a chance for a pink extra point to drop. Definitely grab those. One point may not seem like much but I lost two games by one point so it does make a difference. 

Even with this advice, this is going to take some practice and a little luck. The bots kill you virtually instantly if they're a Sniper, and Rocketeers and Cyclopses are pretty lethal too. So having a match against Gunners and Pyros gives you the best chance of winning. Always target the Snipers and Cyclopses first since they can kill you so quickly. It's much easier to mop up Gunners and Pyros since they do so much less damage. Keep practicing and trying though, and after a few attempts you should be able to finally win a game without capturing any systems.