Here's how to unlock that achievement:
1. You have to visit the city until you can buy a ring. You need to bring food to trigger the event (I recommend bringing at least 4 food items).
2. Once you have the ring, an event with Aya will trigger where you give her the ring. You MUST give it to her. If you don’t give it to her the first time, you’ll miss your chance.
3. Once Aya has the ring, you have to make her angry. The easiest way is to beg or extort money from people; you can do this by choosing that job.
4. Once she’s permanently angry and Aya leaves, abandon Kamila, and the achievement should appear when you reach that ending.