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