Here is the full list of all 48 Persona 3 Reload achievements.
Sealed Nyx.
Watched the good ending.
Maxed out all Social Links.
Nurtured a romance.
Fused Messiah.
Defeated the Reaper.
Unlocked all Social Links.
Earned over a total of 50,000 yen from part-time jobs.
Awakened all teammates' ultimate Personas.
Invited Elizabeth to your room.
Defeated the Hanged Man.
Defeated Fortune and Strength.
Encountered a Dark Zone in Tartarus.
Discovered and conquered 10 Monad doors.
Unlocked a teammate's Combat Characteristic.
Harvested a crop that you grew with a teammate.
Defeated the Hermit.
Dealt over 999 damage in a single attack (All-Out Attacks excluded).
Used all teammates' Theurgy.
Maxed out all Social Stats.
Defeated the Chariot and Justice.
Accepted an invitation to hang out five times.
Unlocked access to the remaining Major Arcana.
Maxed out one Social Link.
Spent an evening in the dorm with a teammate.
Defeated the Hierophant and the Lovers.
Nursed a cat back to full health.
Rescued a missing person.
Maxed out one Social Stat.
Used a total of 50 Twilight Fragments.
Obtained 10 Major Arcana during Shuffle Time.
Performed a fusion with three or more Personas.
Obtained an item from a Persona Conception.
Acquired every Twilight Fragment in town.
Defeated the Empress and Emperor.
Aced an exam.
Ordered from a secret menu at the Iwatodai strip mall at night.
Obtained 10 Personas during Shuffle Time.
Opened 50 treasure chests.
Defeated the Priestess.
Performed 50 All-Out Attacks.
Initiated 50 Chance Encounters.
Defeated a rare, golden enemy.
Triggered a skill change during fusion.
Performed a Shift.
Performed a Dyad Fusion.
Joined the Specialized Extracurricular Execution Squad.
Obtained Orpheus.