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