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