Here is the full list of all 50 Persona 4 Golden achievements. It takes around 150-200 hours to unlock all of the achievements on Windows.
Earn all trophies
Win the Miracle Quiz Finals
Complete the Persona Compendium
Perform 50 Persona fusions
Defeat Margaret
Max out all Social Links
Rescue Marie
Create Izanagi-no-Okami
Register 100 Skill Cards
Defeat The Reaper
Read all books
Max out 10 Social Links
Catch the Sea Guardian
Finish Aiya's special dish
Max out all social qualities
Defeat Izanami
Hear 250 of Rise's navigation lines
Make 5 perfect boxed lunches
Secure Tohru Adachi
Register over 50% of the Compendium
Rank #1 in your class on an exam
Visit Nanako in the hospital 3 times
Rescue Nanako Dojima
Rescue Naoto Shirogane
Deal over 999 damage in 1 attack
Use 4 or more Personas in a special fusion
Go to 3 movies at 30 Frame
Max out a Social Link
Enter a special relationship with someone
Swing the net with perfect timing
Secure Mitsuo Kubo
Win a prize from the vending machine
Drink the coffee at Chagall Cafe
Rescue Rise Kujikawa
Switch Personas 5 times in 1 battle
Get 50 Sweep Bonuses
Buy a Persona from the Compendium
Buy 5 things from Tanaka's Amazing Commodities
Experience a fusion accident
Fight a battle in costume
Rescue Kanji Tatsumi
Defeat a Golden Hand
Rescue Yukiko Amagi
Perform 50 All-Out Attacks
Buy an item from the Capsule Machine
Buy a special croquette from Sozai Daigaku
Exploit enemy weaknesses 100 times
Register a Skill Card
Enter a battle with Player Advantage
Obtain the Persona Izanagi