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