Burnout Paradise

Easiest way is to host a game, set the game to private then get all the stats as high as you can. Do this in each of the category's mentioned above. When your happy with your stats make the party open and let people join. As someone enters start a challenge. People cant break your scores whilst in a challenge so just make sure that everyone in the party is in a challenge. If someone joins half way through stop the current challenge and start a new one. once 8 people are in the party you should get the achievement.

It bears noting that the "top scores" mentioned are 6 our of the 8 following categories:


Air Time
Barrel Rolls
Drift
Flat Spins
Jump Distance
Near Miss
Oncoming
Power Parking

ParanoidPunk's strat probably works, I haven't tried it yet. I just wasted an hour getting top times on 6 streets and waiting for 8 people to join the match.

Either boost with 7 other players, or start a private game while you top the challenges.

Any 6 challenges can be: Drifting distance, Air Time, Jump Distance, Power Parking Percentage, Quantity of Barrell Rolls, Oncoming Traffic distance, Quantity of Takedowns, Quantity of Burnouts, Degree of Flatspin (in one shot), Quantity of Road Rules set by you.

If you boost, just take turns setting the minimum required to lead, top 6, and pop the achievement. Then as you take turns the following player just has to beat the lead by "1". Sometimes if you try to set these while you have less than 8 (like, while you wait for everyone to join the game), the achievement has trouble unlocking. I advise to organize all players to not drive or move their vehicles until all 8 players are in the game. Besides that, you can also simply set another "today's best" AFTER YOU HAVE 8 PLAYERS IN THE GAME, or begin a race once 8 players are in the game.

If you're not boosting, just initiate challenges to prevent other players from beating your leads (thank you DramaticSAnTA), and cancel as necessary as more players join, until 8 players are in the game.

you can open a private match and improve your records until you think they're good enough. then open the game and let 7 people join and hope your scores will last.

Everyone's solution is pretty good; it really is a mix of luck and timing. I did want to mention one thing that affected me - the achievement only pops up if you're leading in 6 of the scores; it's really silly, but the achievement is for 6 leading scores only, no less, (and surprisingly) no more. I was leading in 8, but it only showed up when people beat 2 of my scores. Hope this helps with anyone who's having trouble.

servers close August 1st 2019 which is in 2 weeks. Not sure if anyone will find this solution helpful in this short of time.

I don't know if EA messed with the game since these solutions were written, but all of these solutions are unhelpful on WTF scores the achievement is talking about

this achievement is also really stupid and temperamental.

so here's the helpful information the other solutions are lacking:

best "scores"

to even know what the scores are in a freeburn match:
- press
- tab down to "road rules", press
- press again to turn them on

now in the upper right corner of the screen, you will notice a whole bunch of new tabs. These tabs give a rundown of the scores that count towards the achievement, what they are, and who is leading. Press to tab through them all. The interface is really stupid. If you press at any time, the road rules will turn back off.

You need to be the highest scorer in 6 of the following:

air time
barrel rolls
burnouts
drift
flat spins
jump distance
near miss
oncoming
power parking
road rules
freeburn games
road rules

what you need to do to get the achievement
- you need 6 top scores EXACTLY
- you must get the 6th top score WHILE THERE ARE 8 PLAYERS IN GAME

you won't get the achievement if
you have 6 or more top scores BEFORE 8 players join (this didn't work with the group I was in)

useful info
if you're boosting with a group and someone is screwing around getting top scores when they shouldn't, kicking them and reinviting them will reset their score to 0.

quick and easy boosting guide

- really good place to get 6 top scores quickly is on the beach in the north east part of the map
- get 8 boosters into your game
- tell the 7 who are not going for achievement to not even touch their controllers
- use the jumps on the beach to get
airtime
jump distance
flat spin
barrel rolls
(if having trouble getting a barrel roll, beach is big enough to drive in a circle and get drift)
- leave beach and use road to get
oncoming
near misses

you can get up to 5 scores done while waiting for the 8th player to join.

Again, if you have 6 and an 8th joins, the achievement won't unlock. 8 players must be present when you get your 6th high score to get the achievement.