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