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