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
Defeat Izanami
Hear 250 of Rise's navigation lines
Complete the Persona Compendium
Max out all Social Links
Rescue Marie
Register 100 Skill Cards
Make 5 perfect boxed lunches
Win the Miracle Quiz Finals
Secure Tohru Adachi
Read all books
Visit Nanako in the hospital 3 times
Finish Aiya's special dish
Max out 10 Social Links
Max out all social qualities
Rescue Nanako Dojima
Defeat The Reaper
Buy an item from the Capsule Machine
Rescue Naoto Shirogane
Deal over 999 damage in 1 attack
Catch the Sea Guardian
Max out a Social Link
Secure Mitsuo Kubo
Register over 50% of the Compendium
Experience a fusion accident
Use 4 or more Personas in a special fusion
Perform 50 Persona fusions
Rank #1 in your class on an exam
Enter a special relationship with someone
Drink the coffee at Chagall Cafe
Go to 3 movies at 30 Frame
Swing the net with perfect timing
Buy 5 things from Tanaka's Amazing Commodities
Rescue Rise Kujikawa
Get 50 Sweep Bonuses
Rescue Kanji Tatsumi
Register a Skill Card
Exploit enemy weaknesses 100 times
Perform 50 All-Out Attacks
Fight a battle in costume
Rescue Yukiko Amagi
Switch Personas 5 times in 1 battle
Defeat a Golden Hand
Enter a battle with Player Advantage
Buy a special croquette from Sozai Daigaku
Win a prize from the vending machine
Buy a Persona from the Compendium
Obtain the Persona Izanagi