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