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