Here is the full list of all 16 Chinatown Detective Agency achievements worth 1,000 gamerscore.
You're simply the best
Convinced Kon to turn off Prospero
Took a total of 30 flights
Finished Keeran's case
Visited 12 different cities
You've chosen to work with Keeran full time
Could be better
Finished Tiger Lily's case
You've chosen to work with Tiger Lily full time
Finished a game without Mei Ting's help
Good enough
Destroyed Propsero
You've Shoot Kon
Finished Rupert's case
You've chosen to work with Rupert full time
Finished the first three missions.