Here is the full list of all 16 Black Closet achievements.
Your Queen has been poisoned by the Red Mask Society. Must have been those chocolates.
Unlock All CGs in both art sets
As long as you're both adults...
You have used a minion as your own personal slave.
Win the final conflict with four minions on the Student Council
You have kissed (or been kissed by) a freshman.
Win the final conflict with three minions on the Student Council
The seats recline so that you can look at the stars....
You infiltrated the Red Mask Society in order to betray them
Win the final conflict with only two minions left on the Student Council
One of your minions has gotten a little too possessive.
You have run a lemonade stand.
You have graduated from St. Claudine's.
She's straight, but not rigid.
You have been fully initiated into the Red Mask Society.
You have managed to win a traitorous minion back to your side.