Here is the full list of all 28 Taxi Chaos achievements.
Complete José Rodríguez's quest line
Complete Sandy Miller's quest line
Complete Nikki Stix's quest line
Complete Risa López's quest line
Complete El’iot T’yler's quest line
Complete Jacques Mouse's quest line
Complete Emma Ventour's quest line
Unlock the Yakan Type S
Unlock all vehicles
Complete Mr. Marino's quest line
Complete Jerry Jones' quest line
Drop off 20 customers in a single run
Survive Pro Mode for 3 minutes, or longer
Unlock the TXI 4R
Drop off 11 customers in a single run
Reach the highest point in the map
Unlock the Generic Motors B10
In Pro Mode, earn a 3 star rating or higher
In Pro Mode, earn a 5 star rating
In Arcade Mode, earn a 5 star rating or higher
Complete the Xtreem Mascots quest line
Play for one hour as Cleo
Drive a total of 100 miles
Play for one hour as Vinny
Unlock the Va Veloce
Drop off 100 customers
In Arcade Mode, earn a 3 star rating or higher
Unlock Pro Mode