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