Viewed a tea party conversation for the first time. I'm sure you'll get along with everyone.

Obtain a Key for the first time.

Complete Chapter 4.

Gather all pieces of world intel in a region.

Complete Chapter 3.

Defeat a summon in battle and obtain its materia.

Complete a quest.

Max out a weapon ability's proficiency.

Use a chocobo to find two treasures buried by rabbits.

Raise your Queen's Blood rank.

Complete your search of a cache location.

Use a synergy ability.