EDIT (October 28, 2016):
WB.Games has announced that as of December 4, 2016 "the online services portion of Batman: Arkham Origins will be retired." Whether or not multiplayer play will still be possible after that date is currently unknown, but your best bet is to get this and all other multiplayer achievements for this game wrapped up before then!
"Win a round of each map with each faction in multiplayer"
The first thing you need to know is that wins in Hunter, Hunted don't count
. Only wins in Invisible Predator Online count toward this achievement.
There are four maps:
1) Wayne Chemical Plant
2) Blackgate Prison
3) Joker's Funhouse
4) Wonder City Robot Factory
There are three factions:
1) Joker's gang
2) Bane's gang
3) Heroes - aka Batman and Robin
This means you need 12 different match wins in Invisible Predator Online to unlock the achievement.
There are 8 players in a public Invisible Predator Online match: Batman, Robin, 3 Joker elites, and 3 Bane elites. In a private match, there can be anywhere from 3 to 8 players. The minimum game is Batman, one Joker elite, and one Bane elite.
The map is chosen by voting. Tab to the voting screen with LB or RB and vote for the map you want.
Choosing your faction is a little more complicated. In the Main Menu, you can go to Options and set your faction preference. You can choose either Joker, Bane, or none (no preference). This doesn't guarantee you'll get the faction you want, but it increases your odds.
When you first join a lobby, you won't know what faction you're in until the match starts. On your second and subsequent matches, you'll see an icon next to your name, either a blue person for Bane, a purple person for Joker, or a Batman symbol for Hero.
After each match, there's a process to see who will be the Hero or Heroes in the next game. In general, the members of whichever team won the previous match have what I'll call "dibs" on Hero, but anyone who has dibs can opt out. If everyone who has dibs opts out, or if there are more players opted in than there are Heroes, then the Heroes are chosen by lottery. It's complicated and works differently depending on how many people are in the lobby, but the bottom line is, if you want to be Hero, it helps to have just won the last match.
If you're in the Joker or Bane gangs and you opt out or lose the lottery, you will remain in the same gang you were in.
BOOSTING TALES OF GOTHAM
Now we finally get to the reason why you're probably reading this solution. You see, at the time this solution was written, it was very difficult to play public matches in Arkham Origins Online because of extremely lengthy matchmaking waits and frequent server disconnects when the match was starting. I'm talking maybe one completed match in two hours of time invested. If this situation no longer exists at the time that you're reading this solution, then the future truly must be a wonderful time to be alive. Back in my day, though, if you wanted to unlock this achievement, you had to do it in private matches. And so here are my tips on how to get this achievement most efficiently in private matches.
You'll need a minimum of 3 people. (From here on, I'm going to assume you have exactly three.) You'll have to play a minimum of 36 matches of Invisible Predator Online for everyone to unlock the achievement. Since changing the map is simple, but changing the factions isn't, you should let the first person being boosted get a win on each map. If he's an elite, he should opt out, and if he's Batman, everyone else should opt out. After that player has boosted the four maps with one faction, let player #2 get boosted on all four maps, then let player #3. Then you change up the factions and repeat the process. Do this one more time, and everyone has the achievement. You might have to either play an extra couple of games and/or back out to the main menu and let people reset their faction preference in order to get the factions set the way you need them.
Everyone will need a headset to communicate which map to vote on, whether to opt in or out, and a lot more. There's no way you can get the desired outcome of 36 separate matches without good communication.
Once the match starts, if the Joker or Bane player is being boosted, he should capture all three control points as soon as possible. Each gang periodically loses reinforcements according to the number of control points owned by the enemy gang, so the match will go a lot quicker if all three control points are captured early. Meanwhile, the player from the enemy gang should run up to the player being boosted and let him kill him. The enemy also needs to avoid the captured control points, because if he goes into one for even a second, it becomes neutral again.
Once all three control points are taken, it's useful to agree on one control point where the boosting player will stay, and the enemy should run up to. This is simply because the control points are always marked on the screen, and are therefore easy to find. I recommend the following ones:
Wayne Chemicals - the crosshairs, or whatever that is
Blackgate Prison - the watch tower
Joker's Funhouse - the sun
Wonder City - the lightning bolt
After about 7 or 8 kills, the match should end.
What does Batman do during all of this? Well, he doesn't have to do anything, but he might as well go to the control point where the boosting player is and let him kill him, too, because the boosting player gets more XP that way. In fact, players boosting as Bane can get over 10,000 XP per match just by marking both the enemy and Batman with a tactical dart and then killing them. Players boosting as Joker don't have the tactical dart, but they can still get over 7,000 XP per match by killing the Bane elite and Batman 8 times each. Just remember, killing Batman is only for XP and doesn't have anything to do with winning or completing the match, so if Batman is slow in getting to the designated kill spot, just ignore him and keep the match going.
When it's time to boost Batman, you just have all three players go to the same control point and let Batman do a variety of takedowns on them. You can do silent takedowns, inverted takedowns, ledge takedowns, corner takedowns, grate takedowns, explosive gel takedowns, floor takedowns (after a drop or glide kick), and double takedowns, plus probably some others, but these are enough. The more variety you use, the quicker Batman's intimidation meter fills up. In most cases, after 7 different takedowns, Batman wins.
I did this with two other people. We didn't waste much time, and it took about 4 hours.
If you play a boosting session the way described above, everyone will earn
simply by equipping the same weapon for every match. You will also earn
You will also gain a lot of XP to work toward the four XP-based achivements, so if you haven't earned them yet, work on Tales of Gotham first. Our player who started out at levels 1 1 1 was at 15 14 16 by the time we wrapped things up.