Easy "Attila The Hun" Achievem...
	Various Steam Achievements...

The first premise is owning the Battle Cars DLC. Then it is not that difficult any more to get the corresponding achievements. In fact, most of them can be reached on the small Summit Circuit of Sand Town such as the destruction of three enemy vehicles in ten seconds (three are not possible with the machine gun, so one mine is necessary), the Endurance Race achievement without being blown up (drive away from the grid and use mines after completion of the first round) or the destruction of an enemy who is in midair (there is a jump included in the circuit). Apology for giving guides for another three achievements of the Battle Cars DLC. Perhaps one could try to get all these achievements in one endurance race, but this leads us to the point: Set ENDURANCE RACE on SUMMIT CIRCUIT of SAND TOWN for unlocking the Attila The Hun achievement. The reason is simple and clear: The number of rounds is maximal set to five and the circuit is small such that the propability of meeting all the other vehicles (overtake, lapping) is the highest possible amongst all actually existing circuits. For example position the car in third position before the shooting starts, then get two enemies with the machine gun, two with mines and the other three when lapping them et voilà.

Complete the indicated task to unlock the achievement.

Achievement	How to unlock
(Weekly) challenge accepted	Compete in a weekly challenge.
Airborne Division	Achieve 'Awesome' Air.
Around the block	Visit all of Sand Town's and New Shangri-la's tracks.
Bright lights, big city	Participate in any event in New Shangri-la.
Cheating, surely?	Drive through 3 different shortcuts.
Doing it sideways	Drift over 2000m in a single event.
Driven	Complete Season 3 in career mode.
Dune Hopper	Travel a total of 50 miles in Lightweight vehicles.
Excursion through the scenery	Fall down 3 bottomless pits.
Face Breaker	Accelerate from 0-60mph in less than 2.4 seconds.
Feel the need..	Reach 150mph in any vehicle.
First tweaks	Add an upgrade to any vehicle.
Fly Guy	Spend longer than 5 minutes in total airborne.
Forwards is so overrated	Achieve 'Awesome' Drift.
Garage space at a premium	Own all Light, Middle and Heavyweight vehicles.
Geared Up	Win 150 gears in career mode.
Gears Galore!	Achieve a 6 gears in 10 career events.
Heavy Metal fan	Travel a total of 50 miles in Heavyweight vehicles.
Heavy metal meets movable object	Destroy a reinforced structure.
Hogging the limelight	Remain in the spotlight longer than 3 minutes.
I'll bring it back without a scratch	Race online in a loaned vehicle.
It's the same, but different	Race on any track in reverse.
Journeyman	Reach XP level 50.
Just Cruisin'	Travel a total of 50 miles in Middleweight vehicles.
Leave them all behind	Overtake 5 vehicles in less than 30 seconds.
Make way coming through	Win an Overtake event with zero contact with any other vehicle.
Making roads	Reach XP level 15.
Making room	Remove an upgrade.
Master mechanic	Fully upgrade a Veteran Class vehicle.
Miles under the bonnet	Reach XP level 25.
Mixing it up	Install at least 1 of each type of upgrade
Mixing it with the big boys	Fully upgrade a Rookie Class vehicle.
MkII? Fiesta!!	Level-up any vehilce to a MkII.
Move up to the bumper	Achieve 'Awesome' Draft.
No Claims	Complete 3 consecutive events without smashing any trackside objects.
Photo finish	Win any Race event less than a second ahead of 2nd place.
Progressing nicely	Complete Season 1 in career mode.
Punching above your weight	Beat an online opponent with an XP level 15 higher than your own.
Putting food on the table	Win a total of 150,000 in prize money.
Racing at a higher level	Level-up any vehilce to a MkIII.
Seasoned Pro	Complete Season 2 in career mode.
She's faster than she looks	Fully upgrade a Pro Class vehicle.
Sixth Gear	Achieve 6 stars in any career event.
Taking on the world	Come 1st in 10 online events.
The bigger they are..	Beat an online opponent with an XP level 25 higher than your own.
Total destruction	In single player Time Trial, destroy every roadside object on a track.
Unplug their controller	Participate in a local multiplayer event.
Well that's a game changer	Install a x2 upgrade.
Well that's embarrassing	Lap another vehicle in a race event.
Wrecking the joint	Achieve 'Awesome' Damage.
You want to get in the boot?	Stay in a continuous draft for over 6 seconds.