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