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