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X360A.org says the following:
These 18 achievements are gained by leveling you're driver through levels 0 to 50 (you start at 0). This process goes the same way as leveling up your car, you get XP for driving races, drags, drifts etc. Also both offline and online count towards these achievements. Maybe the best way is to drive online with a friend and use these settings:
Game type: Drag
Track: Sedona 1 mile
Damage difficulty: simulation
Number of heats: 10
Number of max players: 8
Number of max AI players: 7
AI difficulty: hard
Collision mode: always on
Number of teams: 4 (you will be teaming up with your friend)
Put all the assists off (or if you fail the start, you can put TCS on). Choose the 2007 #8 Peugeot Sport 908 (R1 997) and you will most likely win the drag. You get 1,225CR and 700XP for single heat. So when there is 10 heats, you get 10*1,225CR= 12,250CR and 10*700XP= 7000XP.
It takes like 30 seconds to finish one heat, so it's 300 seconds for 10 heats (5 minutes).
I got mine by simply progressing through the career, which you will want to do as well for world traveler, where you choose tracks based on where you haven't been before so that you visit all locations until it pops (the achievement that is)
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