Here is the full list of all 23 World End Syndrome trophies - there are 7 bronze, 8 silver, 7 gold and 1 platinum.
Obtained all trophies.
Found all five colors of the Mihate Town Brochures.
Cleared all missions.
Had a dream about Kaori Yamashiro.
Miu Amana called you a pervert 10 times.
Maxed out all auras.
Collected all CGs.
Read all of the TIPS.
Listened to all of Hikaru Tsukioka's radio episodes.
Received Hattori’s cod-liver candy.
Cleared the Truth route.
Filled in all character slots.
Cleared Miu Amana’s route.
Miu Amana deleted your pictures.
Cleared Yukino Otonashi’s route.
Celebrated Maimi's birthday.
Cleared Maimi Kusunose's route.
Completed the mission "Flowers for You."
Cleared Rei Nikaido’s route.
Revealed Hanako Yamada's true identity.
Cleared Saya Kamishiro’s route.
Watched the worst ending.
Joined the Mystery Club.