Here is the full list of all 44 Retrowave achievements. It takes around 40-50 hours to unlock all of the achievements on Windows.
Reach $1000000
Play 1000 times
Reach 50.000 score in Hard
Buy the moon car
Buy VHS Car
Buy the 16th car
Buy the 15th car
Buy the 14th car
Buy the 13th car
Buy the 12th car
Buy the 11th car
Buy the 10th car
Buy the 9th car
Reach $100000
Play peaceful mode
Buy the 19th car
Buy nitro
Buy turbo
Buy neon wheels
Buy a new paint
Buy the 8th car
Buy the 7th car
Buy the 6th car
Play 100 times
Buy police beacon
Play easy mode
Buy the 5th car
Buy the 86
Buy the 3rd car
Reach $10000
Play speed bomb mode
Play time attack mode
Play 10 times
Buy the 2nd car
Play two-way mode
Play hard mode
Play your first game
Reach $1000
Play one-way mode
Play normal mode