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