Here is the full list of all 50 South Park: The Stick of Truth achievements worth 1,000 gamerscore.
You made friends with half of South Park.
You watched your parents have sex for 60 seconds.
You defeated the Grand Wizard Cartman in battle.
You've farted on people 100 times.
You farted on 10 enemies in the world that were knocked out.
You accepted your fate and chose the name Douchebag yourself.
You knocked out 3 or more enemies with a single fart outside of battle.
You defeated the Boss Hall Monitor while wearing freckles.
You opened all of the garages in South Park.
You defeated the High Jew Elf Kyle in battle.
You befriended the Goths, like everyone else playing this game.
You collected 15 Chinpokomon.
Over the course of the game, you've scored 100 perfect attacks.
You've unlocked all of the upgrades for a New Kid ability.
You completed your first day in South Park.
You have joined the KKK.
In three separate battles, you've taken a shit in your pants.
You shat your pants during a boss battle.
Over the course of the game, you've blocked 100 attacks.
You collected 5 Chinpokomon.
You successfully blocked every enemy attack in a single (non-tutorial) battle.
You flung a turd of your own creation at an enemy.
Let Gingers bite you 3 times without blocking.
Summon Mr. Slave while in Mr. Slave's colon.
Find Jesus while playing as a Jew.
Sell nothing the entire game.
Defeat Princess Kenny while looking like David Hasselhoff.
Fart on the Mayor, Father Maxi, Principal Vic, & Prime Minister.
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 the Meth Tweekers while wearing the Evil Cartman goatee and the bald cap.
Defeat Kenny while sick with Dire AIDS.
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 all the Chinpokomon.
Befriend your Dad.
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.
Fart on animals 25 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.