50g-Beat Yukiko's Shadow. 
25g-Beat Yukiko Castle Mini-Boss 
10g-Kill the Prince first in Yukiko's boss fight. 
5g-Achieve a level 5 social link in any s.link. 
10g-Achieve a MAX s.link 
 5g-Create a Black Frost
 
Go crazy.

i dunno about points.  but there would be one for every max s link and getting the stats all to thier highest level. and of course entering the meat dimmension 

Aww, come on, guys
100g- Avoid ghoul for 50 hours 
 
Sausage Party
100g- Beat the game with Yosuke, Kanji and Teddy
 
I don't know -_-

10g Make out with Fox.

999g - enter the meat dimension
1g - Successfully avoid acquiring Ghoul for the first 5 dungeons.

50g - CHARLIE GIVE BIG HUG

10g - Bufu!!? Description: Cast Bufu on shadow Teddie.

25 G - Three's Company
Have a threesome with Chie and Yukiko
 
25 G - Sunday Mornings are for Church
Molest Nanako
 
20 G - Sunday Nights are for Church Too
Get molested by Dojima
 
50 G - More than Just Friends
Make Yosuke think Kanji really is a homosexual and attracted to him
 
100 G - Time is Up
reach 99 hours and 59 minutes of game time
 
10 G - Fair and Balanced
Kill fox and eat him
 
50 G - MILF Hunter
Seduce Minami Eri

10G - Endure.

I believe somebody already made a thread like this, too lazy to find the link though, as it was old and I forget the title.

You might mean my thread, no? I know mine wasn't the only other one to discuss achievements and Persona 4, but it did involve copious amounts of lazy Photoshopping. 
 
For posterity's sake, this is it.

50G- What's this muscle called?
Pull Mrs. slutty nurse.

Tentacle rape-100 points

25G - Yo Bro, Let's Go   
Get it on.....with Kanji.

50G - (Oh. You're still here?)
Get past the three hour introduction.

999999999g- you got this game to work on 360 lol

10G- Dont advance S.Link with Yosuke past  lvl 1
50G-Make it through Yumi's Depressing Social Link

"  10 G - Fair and Balanced Kill fox and eat him"

• -5000G (Galactic Punted) 

50G -(You did it)
Get the true ending
 
50G-(No longer a reverse trap)
Get Naoto to wear a girl school outfit
 
10G-(Call of the wild)  
Get all Chariot Personas
 
5G-(You got brains)
Get the highest score on any test
 
5G-(Riddle brother)
Finish the first riddle quest
 
15G-(She tougher than nails)
Beat Margret  
 
10G-(You killed who!?)
Beat Death
 
5G-(Heart breaker)
Choose to not get the girl
 
10G-(A true friend)
Max social link with Yousuke
 
10G-(Upbeat gal)
Max social link with Chie
 
10G-(A inn princess)
Max social link with Yukiko
 
10G-(The tough guy)
Max social link with Kanji
 
10G-(A true idol)
Max social link with Rise
 
10G-(The mysterious girl or Detective princess)
Max social link with Naoto
 
10G-(Everyones favorite bear)
Max social link with Teddy

10G-Beat Youske Up 
 
50-Complete the Beaf Bowl Challenge 
 
100-Cast Bufu on an enemy that drains Bufu 
 
50-Get a Nosebleed

"1g - Successfully avoid acquiring Ghoul for the first 5 dungeons. "

"999999999g- you got this game to work on 360 lol "

" 50G - (Oh. You're still here?)Get past the three hour introduction. "

10G - RIddle Me This 
Become a riddle brother.

1G - Stop it.
Complete New Game +

25G - Don't Trust Bitches
 
Learn life lessons from Adachi

" 25G - Don't Trust Bitches  Learn life lessons from Adachi "

20g - Get within 1 meter of Naoto Shirogane.

" 20g - Get within 1 meter of Naoto Shirogane. "

50G Aha! Is This Our Chance? - Perform an All-out Attack 100 times.

10G Under the Kotatsu - Get scolded by a drunk Dojima.

I'm a Trophywhore, so a Golden Trophy:

STEAKS!

Been in the Meat Dimension.

10g -- I looooooooove them balls!
      join a social club

50g - How to build a bomb: Finish the game in exactly 99 hours and 59 minutes.

" 999999999g- you got this game to work on 360 "

50G - You caught me bitches.... - Found the true ending.

Endurance Run 10g - Played the game non stop for 5 hours.

Man, a watermelon! 50g - Get all Investigation Team members bent

20g - Save Yourself the Trouble 
"Narrowly avoid becoming Ai's boyfriend" 
 
 
20g - Good Riddance 
"Do not save Nanako before the deadline" 
 
 
20g - Tapped out 
"Consume 100 Tap energy drinks within 1 hour of in-game playtime" 
 
 
20g - Strong and Silent Type 
"Successfully complete every conversation without one second of spoken dialogue." 
 
 
100g - Not your Father's Backseat 
"Become intimate with someone in the Velvet Room"

Slow to Turn (Use the Capsule Machine)
 
Popularity Leads To Intimacy (Use Exam Results to Your Advantage...)
 
It Never Ends! (Go for the True Ending)
 
BIRRRDMAAAANNNNN!!! (Summon Andra)
 
Your Relationship has Intensified (Dream of Chie)

50G - Very Hard to Get: Become intimate with Naoto
 
10G - Too Many In-Jokes: Go to Tatsumi Port Island 
 
15G - The Next Billy Mays: Buy 10 items from Tanaka
 
20G - Hopeless Bromantic: Max out all of the male social links in which a bromance would be possible (Yosuke, Kanji, Kou/Daisuke, Teddie, Naoki, basically the dudes around your age)

100G - You Hold the Rope, You Hold the Golf Club, We Crawl Into the TV!: Defeat the Ninja Disco Frog
 
1G - This Social Link Used to be Cool: Get real psyched for the Nurse social link, then become more and more disappointed 
 
 1000G - Ultimate King Fighter: Promise that you'll fight a king to a friend then don't do it. 

50G- Get bent!: Defeat shadow Kanji
 
50G- Child's play: Defeat shadow Naoto

10G: Angry old teacher- Get on Mr. Mooroka's shit list.

50G: Sexy Time!!!! - Become intimate with all the girls.

all of them !

5G- What a nice room: Enter the Velvet room for the first time.

 5G- What did I just read!?: Read the Twilight book in the game( It's really in the game)

 5G- What did I just read!?: Read the Twilight book in the game( It's really in the game) "

im surprised no one did this:
20G- GET BENT!
Get bent with Kanji (bomchikawahwah).

10G - Why Would You Do That?: Eat Nanako's science project that she was keeping in the fridge
 
5G - Wait, huh?: Accuse Fox of being the murderer
 
100G - Aren't They Just Adorable Together?: Fix Teddie up with Yosuke
 
150G - Wait, How Would That Even Work?: Fix Teddie up with Yosuke before Teddie becomes human