The multiplayer achievements are not difficult in themselves. As explained, it is the terrible quality of the matchmaking that makes them such a drag. Just be prepared to be frustrated from simply waiting to be matched up. The boosting itself is rather simple and easy.
For these two achievements, your simply need to complete and win a standard Ranked deathmatch game respectively. However, it HAS to be standard deathmatch. It cannot be any other type or variation, or it WON'T COUNT. Standard deathmatch is free-for-all, not team-based, and requires a minimum of 3 players to launch. If you plan on boosting, then you will have to search individually. Regardless of whether you opt for boosting or simply playing 'legit', it will probably take quite some time simply to find and get into a match. If you win your first match, both of these should pop together.
For this achievement, you will need to win 10 Ranked deathmatches. However, unlike the previous achievement, these can be in any mode. They do not need to be the same gametype, so if you have already obtained the Killer Instinct achievement, then that will count towards the 10 wins for this achievement. While working on this, you will also want to work on the following two achievements.
To obtain Persecutor status, you will need to kill the same enemy five times in a row. However, in order to obtain it twice in the same game, you will need to be killed by the player being persecuted in order to get out of Persecutor status. Otherwise, you won't be able to get it a second time. Since you need 10 kills in a row without dying for the Very Tough Hombre achievement, you can get 10 kills, get killed, and then get the last five OR you can get five kills, get killed, and then get 10 in a row. Your choice.
This achievement is apparently quite confusing, in that people believe you need only six people to obtain this achievement. However, as the achievement description states, you will need six people in addition to yourself, and you will need to add them all as friends prior to starting the game and partying up. Whilst a deceptively simple achievement, it can nevertheless be a pain given the issues outlined.
Finish a Ranked Infestation match as the only remaining prey
This achievement requires playing in a ranked infestation match. As such, you must search individually, and randoms, if any are still playing, are the biggest risk here. This game mode starts everybody off as marines but with one alien (the person who is the alien is selected at random). As the alien kills the marines, the dead marines will respawn as aliens. To earn this achievement, the game must end whilst you are the sole remaining marine. No one else can survive as a marine, and you must avoid getting infected. Note that if the host quits the match, the achievement is void. The game MUST be played to the end.
As a team, kill 20 enemies in under 60 seconds in a Survivor match.
Both of these achievements require you to play in Survivor, which is essentially a wave defence game mode whereby you and the other players play as Marines who have to hold off against increasingly more difficult waves of Aliens. You can do this in Single Player, but you can also do it with other players. However, since the Scatter Shot achievement requires you to play as a team, you WILL need to play online to earn both achievements. For the Scatter Shot achievement, I recommend playing with three others as you will be able to kill more Aliens faster. For the Ain't Got Time to Bleed achievement, you will need to let the Aliens hit you, run away whilst your health regenerates, and then let them hit you again. Rinse and repeat, and this achievement should be yours.
For these two achievements, you will need to grind XP. Given that the MP is largely dead, and that the matchmaking system is a festering pile of offal, this will need to be boosted. You will need 8 people divided into two teams of four. Make sure that the party leaders are players who can connect with each other easily, and you should be fine. However, you should still expect half the battle to be negotiating the unwieldy matchmaking system or just trying to even find each other. The boosting is simple but dull. You will be playing Domination as the kill limit is 100. Just as long as nobody accidentally captures any of the capture points, the game will not end until someone reaches 100 kills. If somebody DOES capture a point, simply have someone on the other team neutralise it (but make sure that they do not capture it either).
Now, one team will be playing as Aliens, and the other team will be playing as Marines. Find a spot that is relatively out of the way. The Marines will each be paired with an Alien player. The Marines will each get 99 kills via melee. The best way to do this is for the Marine player to shoot their Alien partner in the head thrice, in the torso twice, and then finish them off with a melee. There is a glitch whereby the Alien body will then begin to 'spazz out' twitching all over the place. It is important that the Marines KEEP meleeing their Alien partners' dead bodies until they respawn. Due to the glitch, the Marines will earn 10xp per melee hit on the dead Alien body. Once the Marines have reached 99 kills, the Aliens will then get 99 kills each. One player will then get the last kill to end the match. During the next match, the Alien team will play as Marines and vice versa to ensure everybody gets the same amount of XP.
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