Here is the full list of all 15 CyberTaxi achievements.
You have reached Downtown.
You have successfully passed the driving school.
You have reached The Park.
You have reached The Old Town.
You have reached The Projects.
You have acquired a Punisher.
You have acquired Mr. Mulch Shotgun.
You have acquired a Fusion Crossbow.
You have acquired a Shocker.
You have obtained a Lightning Saber.
You have mounted a Buzzsaw.
You have reached maximum reputation with Hackers.
You have reached maximum reputation with Gambricorp.
You have reached maximum reputation with Neo-Church.
You have destroyed the main boss in the last district.