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