Here is the full list of all 25 Little Witch Academia: Chamber of Time achievements.
Collect all of the room decorations.
Learn all of the battle spells.
Watch the Sucy Episode.
Watch the Constanze Episode.
Watch the Amanda Episode.
Watch the Diana Episode.
Watch the Jasminka Episode.
Watch the Akko Episode.
Watch the Lotte Episode.
Collect all volumes of Night Fall.
Recover 18 Chariot Cards.
Complete the Ghost Witch and Last Nightmare.
Complete the Time Demon and the Labyrinth.
Obtain the Pollux Key and traverse the Labyrinth of Pollux.
Obtain the Shooting Star Replica.
Become the Queen of Spice in the Super-Spicy Showdown.
Obtain the journalism club microphone.
Complete the Hourglass of Fire and Ice.
Earn the title of Laundry King in the Laundry King Championship.
Obtain the Gienah Key and traverse the Gienah Tundra.
Obtain the Shaula Key and traverse the Shaula Desert.
Obtain the Regulus Key and traverse the Regulus Mines.
Complete the Guard Dog and the Pendulum.
Obtain the Ankaa Key and traverse Mt. Ankaa.
Obtain the Mimosa Key and traverse the Mimosa Forest.