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