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