Here is the full list of all 13 Autumn's Journey (HK/TW) trophies - there are 1 silver, 11 gold and 1 platinum.
Get all other trophies.
Get Ilmari's romantic scene.
Befriend Kerr and Ilmari.
Read together with Ilmari.
Complete the gather 5 nightshades quest.
Complete the INTENSE RESCUE MISSION!?!?!?! quest.
Complete the Go Fishin! quest.
Get Kerr's romantic scene.
Wrestle with Kerr during your patrol.
Complete save the chickens quest.
Complete Honey-Glazed Apple Tarts quest.
Complete the aviterral feathers quest.
Wake up Kerr with your mighty stick.