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