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