Here is the full list of all 21 LoveChoice trophies - there are 2 bronze, 10 silver, 8 gold and 1 platinum.
Get all other trophies.
Do not spoil the surprise in LOVE · DETECTIVE.
In LOVE · DETECTIVE get the ending by discovering the truth.
Do the housework while investigating in LOVE · DETECTIVE.
Find the clue in the trash can in LOVE · DETECTIVE.
In LOVE · DISTANCE don't let her go.
In LOVE · DISTANCE let her go when the time is right.
Do not become friends with the new girl in LOVE · DISTANCE.
Get the bad ending in LOVE · GAME.
You have cleared everything in LOVE · GAME.
Get the neutral ending in LOVE · GAME.
Get the best ending in LOVE · GAME.
Figure a way to balance the housework in LOVE · GAME.
In LOVE · GAME get closer to your girlfriend and properly listen to her.
On the discussion scene in LOVE · GAME don't insult her.
In LOVE · GAME Talk about everything in your phone calls.
Hold hands in LOVE · GAME.
In LOVE · GAME chose the perfect movie and restaurant for your date.
Finish the restaurant mini-game with 11/11 in LOVE · GAME.
Like all her posts in LOVE · GAME.
Start the conversation naturally in LOVE · GAME.