Here is the full list of all 26 Little Witch Academia: Chamber of Time trophies - there are 9 bronze, 9 silver, 7 gold and 1 platinum.
Complete the Ghost Witch and the Last Nightmare.
Recover 18 Chariot Cards.
Complete the Time Demon and the Labyrinth.
Obtain the Pollux Key and defeat the Time Demon in the Labyrinth of Pollux.
Obtain the journalism club microphone.
Complete the Guard Dog and the Pendulum.
Obtain the Ankaa Key and defeat Cerberus on Mt. Ankaa.
Obtain the Mimosa Key and defeat the Great Treant in the Mimosa Forest.
Complete the Hourglass of Fire and Ice.
Obtain the Gienah Key and defeat the Divine Dragon in the Gienah Tundra.
Obtain the Shaula Key and defeat the Ant Queen in the Shaula Desert.
Obtain the Regulus Key and defeat the Giant Slime in the Regulus Mines.
Collect all trophies.
Watch the Akko Episode.
Watch the Lotte Episode.
Watch the Sucy Episode.
Watch the Amanda Episode.
Watch the Constanze Episode.
Watch the Jasminka Episode.
Watch the Diana Episode.
Collect all volumes of "Nightfall".
Learn all of the battle spells.
Collect all of the room decorations.
Earn the title of Laundry King in the Laundry King Championship.
Become the Queen of Spice in the Super-Spicy Showdown.
Obtain the Shooting Star Replica.