Here is the full list of all 20 Neon Seoul: Outrun achievements.
Score 50,000 Points
Watch a video in the lobby
Get two near misses in traffic
Score 5,000 Points
Race a total of 100 kilometers
Launch a car into the air
Escape those pesky cops
Recharge your overshield
Get into the game rook
Enter Free-Ride mode and earn your stripes
Test your meddle on the Seoul Highways
Get into the boost and feel the speed
Beat your own record 3 times
Hit that Max Boost speed
Hit that Max Boost speed for 10 insanity-filled seconds
Score 25,000 Points
Score 100,000 Points
Score 250,000 Points
Score 500,000 Points
Score 1,000,000 Points