Here is the full list of all 16 Chinatown Detective Agency achievements worth 1,000 gamerscore.
Finish the first three missions.
Choose to work with Rupert full time
Choose to work with Tiger Lily full time
Choose to work with Keeran full time
Finish Rupert's case
Finish Tiger Lily's case
Finish Keeran's case
Convince Kon to turn off Prospero
Get the best ending
Get the good ending
Get the least ideal ending
Take a total of 30 flights
Visit 12 different cities
Finish a game without Mei Ting's help