Here is the full list of all 50 South Park: The Stick of Truth achievements worth 1,000 gamerscore.
You have joined the KKK.
You completed your first day in South Park.
You befriended the Goths, like everyone else playing this game.
You successfully blocked every enemy attack in a single (non-tutorial) battle.
Over the course of the game, you've scored 100 perfect attacks.
You knocked out 3 or more enemies with a single fart outside of battle.
You've unlocked all of the upgrades for a New Kid ability.
Over the course of the game, you've blocked 100 attacks.
You defeated the Boss Hall Monitor while wearing freckles.
You defeated the Meth Tweekers while wearing the Evil Cartman goatee and bald cap.
You farted on 10 enemies in the world that were knocked out.
You flung a turd of your own creation at an enemy.
You collected 5 Chinpokomon.
You found Jesus while playing as a Jew.
You've farted on people 100 times.
You've farted on animals 25 times.
You accepted your fate and chose the name Douchebag yourself.
Defeat Kyle in battle.
Defeat Cartman in battle.
Let Gingers bite you 3 times without blocking.
Summon Mr. Slave while in Mr. Slave's colon.
Open all garages in South Park.
Sell nothing the entire game.
Defeat Princess Kenny while looking like David Hasselhoff.
Fart on the Mayor, Father Maxi, Principal Vic, & Prime Minister.
Shit your pants during a boss battle.
Fart on a canine enemy while in Gnome form.
Defeat Princess Kenny while in your Makeover disguise.
Fart on each available buddy in the game.
Interrupt 5 channel attacks with a fart.
Defeat Kenny while sick with Dire AIDS.
Watch your parents have sex for 60 seconds.
Defeat at least 3 enemies in one battle while your buddy is unconscious.
Complete the game without ever ending a combat with a buddy knocked out.
Collect 15 Chinpokomon.
Collect all the Chinpokomon.
Befriend your Dad.
Befriend Half of South Park.
Befriend all of South Park.
Sell 300 junk items.
Defeat Princess Kenny and Recover the Stick of Truth.
Kill 20 enemies with Cartman's ass.
Shit Your Pants in battle three times.
Complete half of the available costume sets.
Complete all available Costume Sets.
Fart on the corpse of an aborted Nazi Zombie fetus.
Befriend Crab People and Underpants Gnomes.
Have Kenny Die 10 times in battle over the course of the game.
Spend $500.
Collect all the weapons and costumes available in the game.