Here is the full list of all 38 Oblivious Garden ~Carmina Burana achievements.
Make D rank tea for the first time.
You go your separate ways.
Some things are better left unsaid.
It is not polite to peep at a lady's diary.
Meet a strange lady in a strange place.
All you have to do is to be a good listener.
That is not a documentary fiction, my princess.
Are there any secrets behind her?
Enjoy Leira's violin playing.
Something serious may happen if you were not quick enough.
Come across Marian at the fencing hall.
Make S rank tea for the first time.
Collect all the tea recipes.
Get the highest level in tea game.
Collect all tea ingredients.
You made the most tasteful tea.
Get S rank in all kinds of tea.
Unfortunately, you didn't finish your job.
From now on, you live happily ever after.
It is destined that we meet each other again.
This is an unexpected ending.
Who is that girl? You will never know.
Lin accomplished her dream, and so did you.
A lily would be nice.
You finished your job, but this is not the end of the story.
Read all epilogues.
Do not tell this secret to anyone.
The princess and the prince promised to be together forever.
You fail to satisfy the princess, dont you?
Here comes emperor of Celantu.
The tea you made is not good enough to win the princess.
I may, or I may not, who knows?
Watch the credits.
Finally lose the friendship with Rumi.
It's you and not the others.
Leave the fencing hall.
Make tea that is fit for a princess.
Finish the special chapter.