Bulletstorm

********** EASIEST METHOD TO DATE ***********

This is much more doable and easy with only 2 people on Deadrock.

Player 1 stands on the scaffolding above the vortex.
Player 2 stands down low on the scaffolding next to the vortex.

Slide kick the enemies and the other player grabs them pulling them into the vortex awarding you: TEAM - Not in Kansas, Shocker, and Yoink. (Sometimes Gotcha for the right enemy). Then you add the flail to it and get Team Sadist. So thats 200, 100, and 75 points x2 then another 100 x2 for team sadist.

Lvl ups
Leash Fully Upgraded
Defense/Speed - Fully Upgraded (ignore Power)
PMC fully upgraded.
Flail Gun fully upgraded (ignore charges)

Me and a buddy did this last night and got over 60k and we made mistakes. over all we both got over 260k waves 1-20. This is by far the easiest method to get this having only 2 players is a huge benefit to making it more simple. Video in the comments highlighting just how easy this is. Also this is more than likely the fastest way to get to lvl 65 as well. i went from 58-62 in just waves 1-20 once doing this last night.

First I'd like to thank Darkchyle, Raegarin & Spit5ire for helping me with the achievement.

What you'll need:
4 players, all with mics & in party chat and committed to work together.
(Credit to EchIlIon: "Just wanted to add that this achievement is possible with just two people.")

Duration to complete:
Roughly 2+ hrs, depending on teamwork & familiarity with the flow of performing team kills. More time required if you are unable to get 50,000 points at the last level (level 20), see below for details.

Achievement will unlock during the game, once the combined team score reaches or exceeds 50,000 points in a single wave/level (which is usually the last wave/level).

We played on Public match, but the achievement can also be unlocked in Player matches.

Map:
Dead Rock, level requirement 30,000 points.

Player placement tips:
All 4 players spread themselves around the electrical vortex.
Player A up top near the metal platform facing the electrical vortex.
Player B at the pipe area nearest the metal platform near the cliff. (You'll need to crouch or slide under the pipe)
Players C & D spread themselves out near the dinosaur skull.

Tips to score points:
Pair off, Player A with Player C, Player B with Player D.
General idea is for Player A to kick enemies towards Player C so that Player C can leash them into the Vortex (& vice versa for Player B with Player D) - not only will both players earn Individual Points but additional Team Points as well. Communications is vital to make sure your partner is ready to leash and kick in their general direction. If your partner is not ready, kite the enemy by running around, even if you can't maneuver at the highest defense level you'd be able to withstand alot of damage.

You should be getting points for skills like Gotcha, Yoink, Not in Kansas.
Avoid double-leashing for Tug-of-War, it won't score as much points unless it is a bonus Skill Kill target. (Credit to Spit5ire: For additional 100 points, use the Flail gun on the target before starting the team combo)

Don't kick enemies near the edges, because the Vortex might just suck them in and deny you & your partner the chance to leash them. So once the enemy is attacking you, check with your partner if their ready, warn them you're about to kick, move back abit from the edge to pull the enemy towards you & kick. Your partner should be able to see the blue-halo outline of the enemy and leash them.

For Player B (see player placement guide above), because of the lack of space, kick your targets along the path instead of towards the Vortex. Your partner (Player D) should still have enough reach to leash your targets.

The goal is to score as much Team points and to complete the level requirements early for additional bonus points! We scored an additional 1.7K points by reaching 30K points with about 27 enemies to spare.

For snipers & fast enemies, just slide towards them & let your team mates leash them. You can also slide under the pipe area for Player B.

If a boss enemy appears, best to ignore the normal enemies and try to help your friends take out bosses. Working together you can also score Team Points like Whiplash or Bossed which are both an additional 300 points each! Boss enemies can be tricky at higher levels, so co-ordinate your attacks carefully. Damaging or killing Boss enemies can cause area damage and kill normal enemies (like the Cannoneer's exploding backpack) so watch out that taking out Boss enemies doesn't deny your team of potential Team points from normal enemies.

For enemies that reward points for skill kills, kite them to the location and kill them together with your team mates.

Skill & weapon management:
1. Upgrade leash, defense & speed (roughly in that order).
2. Those players with excess points should upgrade to Thumper early on in case enemies with skill challenges like Slamdunk appears (I think we encountered our first Slamdunk around level 10).
3. Concentrate only on upgrading the default gun's speed & ammo. We didn't find other weapon unlocks & upgrades useful, and may kill off normal enemies too early. We didn't bother with Charges for the default gun.
4. If a player finds himself low on purchasing points, swap places with Player A (see player placement guide above). We only did this once to help a buddy who had lower points.

Level 20 tips:
1. If you have 10 enemies left & still have not unlocked the achievement, please check with your individual points & total it. If you still have alot more to go before hitting 50,000 points, just get all players to commit suicide and restart the level. If you don't and end the match, you can't restart the level to score 50K points. We did this once when we had only 7 enemies left and were under 40K.
2. The game will spawn multiple enemy bosses so watch out. Work together to take them out. Be prepared to revive downed team mates, yes it does happen.
3. Credit to CloakedVengance: "One thing to add if you are at 48/49k you can leave 2 or 3 bad guys alive and keep getting downed and then reviving people for an easy 50 points a time, we used this method to get us over the finishing line."

I really hope this help those still struggling to get this achievement, we had plenty of close calls but tons of fun playing this game mode.

Here is an alternative method the ones described above if you own the gun sonata dlc. You only need two people for this but can have more if you wish. What a buddy of mine and I did was play to wave 20. We both upgraded fully our leashes, thumper, personal skills, and a few of our weapons. Gather all the small enemies, everyone smaller than the bosses, near the bell. One player thumps them in the air and the other either leashes or shoots he bell right as they are about to fall. Timing is important he re because you can either get only 200 for flyswateer or whatever it's called or as much as 600 per kill depending on your timing. It is a less tedious and way than using the tornado place in my experience. Also when you focus on the bosses, make sure to get as many team bonuses as you can. With a bit of luck, you will get there. We ended up with about 53,000. Give me a positive or negative vote I don't really care.

AFK method very easy

for this solution you are going to need 2 copy's of bulletstorm 2 xbox360 2 accounts (or boosting partner) and one rapid fire pad

play on Deadrock
at the edge of the map balcony where you can see the view beyond the map right go up them stairs then stand in the left corner after that with your second account stand in front of your main account if done properly you will shield your main account so he can not get hurt right get to wave 5 then kill everything but gunner bad guy's the mini boss will also spawn dont kill him as well they will stay away from you and shoot ur 2nd account keep reviving him pressing B on ur pad
giveing you 50 points a time

now rapid the B button down leave 6-8 hours achievement unlocked 30G

ive tried to explain as best as i can if you are stck messge me and ill try explain better

How we got it with 4 players.

Dead Rock. Play until you get to wave 20. Players one and 2 need full leash recharge and full Flail gun ammo.

Player 1 - up top on the scaffolding.
Player 2 - other side of the twister.

Players 3 & 4 - Taking down the Bosses and the Team challenges.

Players 1 and 2 slide, leash or kick players into the air ( but not towards the vortex). The other player leashes them through the tornado to get

- Yoink
- Not in Kansas
- Shocker
- and sometimes Gotcha

for an added bonus shoot enemies with a flail before putting them in the air to get Sadist.

When you get down to the last 3 guys just keep letting the baddies down 2 of the players while the other 2 do revives.

NOTE: THE ACHIEVEMENT WILL UNLOCK AS SOON AS YOU GET TO 50,000. Keep doing the downs and revives until it pops or you may have to play the whole thing over again.

The achievement is to gain 50,000 Anarchy points as a team in one round. That means players must work together to gain points. By the end of round 20 both you and your partner need a score of 25,000+. If both of your points don't add up to a sum of 50,000 team points you can have the last enemy kill both of you, and it will restart at the beginning of round 20 for you two to try again.

First create a private match on Deadrock, with you and a friend.
Me and a friend(SKX Sick One) finished this achievement last night with some improvements to the top solution. It is easiest to do with two people to negate the hassle of 4 man anarchy and prevent chaos in communication.
DO THE ACHIEVEMENT IN ROUND 20 with 72 enemies and plenty of bosses.
Both players need to wait until round 20, but while you're waiting to get to 20 for the two hours, yeah I said two hours, you should practice the tornado method to get the needed score to progress to the next wave.

TORNADO METHOD:
One player stands on the scaffolding looking towards the tornado while the other player stands in front of him below, on the ground.

Now on normal waves there will be normal enemies you can grab with your leash automatically without kicking them. We devised a plan to grab on to a friends enemy on their side of the map and holding them until they could shoot the enemy with a flail gun. After the player that shot the flail gun should kick the leased enemy, and the player with the leashed enemy should let go and it will pull the enemy into the tornado. If you can pull this off correctly you can net Not in Kansas(200), Shocker(150), Yoink(75x2), and Sadist(100x2) for a grand total of 700 points per kill.

Now for the bosses during the 20th round you should avoid all other enemies when the bosses show up, and focus on them. To net the highest team points one player should use their charge shot on the PMC, to tear off his armor and helmet with the leash. Once the helmet is off have one player down the boss with a charge shot, and the other player grab his head with the leash and yank it off. This will get you the team bossed(300x2) and team whiplash(300x2) to give you a total of 600 points a boss and since there is 10+ bosses on the 20th round it can get you a total of 16,000 points each player.

What upgrades you will need are:
Leash Fully Upgraded
Defense/Speed - Fully Upgraded with the exception of power
PMC fully upgraded with the exception of charge shot.
Flail Gun fully upgraded with the exception of charge shot.

It is also a great way to level up both you and a friend, for example I started at level 28 and ended up a level 39 at the end of the game.

I've done this twice with 2 different groups, using the Deadrock whip method, only difference that I don't see is we used three people. Two players do the sliding/whipping and all the third guy needs to do is revive, help with team challenges, and kill mini-bosses.
What seems to be what puts it over the top is all 3 players being involved in killing the mini-bosses, everyone gets the points and two players get the extra double elimination. Both times we reached 50K well before the end of wave 20 (10-20 enemies left)

The "I'm fully aware everyone already knows this" method.

Just thought I'd elaborate it on how it went down for us.

4 players on Dead Rock.

2 guys on each side. 1 in front up against railing, the other in back, a little to the side(to make it easier for leashing).

The 2 guys in front are MOSTLY responsible for leashing enemies into the tornado from the other side that are FLOATING IN BLUE. And of course helping their teammates that go down, team challenges and Bosses.

The 2 guys in back and a little to the side are responsible for saying "ready to leash" and waiting for a "yep" from the across railing guys to be ready to leash. Once they get that "yep", they then flail and leash/kick an enemy(keeping them floating blue in the air on THEIR side).

ANY of the 4 guys also call out "boss" every time bosses appear. ALL 4 guys always stop everything they're doing to completely go towards bosses/team challenges to help kill them.

Bosses should be killed 1 of 2 ways. Conservatively for 450 points with an easy double penetration technique. OR... Aggressively by shooting them just enough that they kneel for you to leash off their helmet. Then shooting them just enough AGAIN that they kneel a second time for you to leash off their head. Which in turn gives you 600 points.

Remember, you WILL make mistakes. It's the executing and mastering the Sadist, Not In Kansas, Yoink, and Gotcha method the majority of every single enemy that gets this achievement. And of course not failing many team challenges and making sure to kill bosses for 450 or 600 points instead of just 300.

We got the achievement on the 5th try of the final wave doing it this way. A simple switching up roles is what did it. We didn't switch sides, we switched from being in front to being in back basically.