Halo 4

To unlock this achievement, you must win 20 matches, the gametypes you can unlock this through are;

Infinity slayer- Team gets 60 kills overall to win

Big team infinity slayer- Team gets 100 kills overall to win

Dominion- Capture 3 control points and eliminate enemies

Regicide- Come in first, first place also has a bounty when killed

Flood- Infection flood kills spartans, they turn to flood

CTF- Capture the flag, capture 5 flags to win

Oddball- Get the most score when holding the ball to win, team game

KOTH- Get the most score as a team to win

Team slayer pro- Standard 4v4 no radar 60 kills to win

SWAT- One shot headshot, 60 kills to win

You must join from the beginning or it won't count, but will add to your total, thanks General Joury for confirming this

You must be first place in a free for all game as well

Good luck- if you spot any holes in the guide either send me a PM or drop a comment below :)

You can check wins at;

https://app.halowaypoint.com/en-us/Halo4/

Under war games: matchmaking

Tomblyboo117's guide is very useful for most players, but this guide is for those of you who don't really play multiplayer, or for those of you who do, but you really suck. (BTW, I'm not claiming to be any sort of expert)

Stick to Big Team Infinity Slayer, Dominion, and less preferably, CTF. The team sizes for these playlists are 8v8, 6v6, and 5v5, respectively.

The larger team sizes of these playlists means that your lack of skill won't be as big of a weight on the team, and you're bound to on the winning side every now and then. On the other playlists, even with the team games, your lack of skill will have a much more significant effect on your team's ability to win the match, which will make it harder for you to get the Achievement.

In addition, because of the larger maps and team sizes, you can still help out your team without screwing up too much and contributing to the opponent's success.

Hang back at your base and try to shoot opponents from afar with the Battle Rifle, DMR, or Light Rifle when you see those opponents engage your teammates. Even if you don't get many kills, it will still help out your teammates a lot, and it's good practice.

In Dominion, you can hang either at your starting base, as described above, or hang out at the capturable base closest to your starting base (either Alpha or Charlie). You can construct turrets, try to fight off intruders, and recapture the base node if an opponent manages to initiate a capture. Again, try picking off guys from afar.

One thing you should not do, is continually charge into battle every time you spawn and get killed over and over. Especially in Big Team Infinity Slayer, this will hurt your team a lot because the other team will get a lot of points and ordanance drops. Also, don't take vehicles and power weapons if you're terrible with them. If for example, you take the wraith (purple tank) and get blown up five seconds later, the other team will be able to wreak havoc with their wraith, and your team will be much worse off than if you let another teammate take it. The cost is more than just you dying. Your team needs vehicles and power weapons to match and outmatch the opponent's vehicles and power weapons, or else your team will quickly fall behind. If you're decent with certain vehicles and power weapons, take them, and practice with them, but remember, if you make it easy for the other team, you're going to be that much farther away from earning this Achievement.

Now, you might be thinking that you could also join these big team games and just find a place to hide. That's true. Do that enough times, and you'll eventually get 20 wins, but honestly, that's no fun, and if you at least play some, you can practice and start to get better.

The most important thing is to recognize when something is not working and to stop doing it; try something different. If you run out into the open and try to spray your gun at the first guy you see, and it gets you killed nine times out of ten, stop doing that! It obviously doesn't work and you're hurting your team. Playing more like a coward is good in the beginning. Let the better teammates do the Rambo, you stay at the edges of the fight and help out that way.