Here is the full list of all 23 Jalopy achievements.
Use the horn till it burns out
Dispense 300 Marks into the East-German economy
Read Uncle's letter in his suitcase in Turkey
Smuggle 6 bottles of wine through a single checkpoint
Read Uncle's letter in his suitcase in Bulgaria
Read Uncle's letter in his suitcase in Yugoslavia
Dispense 350 Marks into the CSFR economy
Read Uncle's letter in his suitcase in Hungary
Cleaned the car 50 times
Read Uncle's letter in his suitcase in CSFR
Run out of fuel
Read Uncle's letter in his suitcase in Germany
Experienced a really big collision
Drive 10,000 KM
Drive 50,000 KM
Drive 100,000 KM
Max out the odometer
Dispense 400 Marks into the Hungarian economy
Dispense 450 Marks into the Yugoslavian economy
Dispense 500 Marks into the Bulgarian economy
Dispense 550 Marks into the Turkish economy
Experienced karma
Drive from Germany, to Turkey, and back to Germany in one session.