Fart on the Mayor, Father Maxi, Principal Vic, & Prime Minister.
Here is where each of the four people is located in the game. You need to fart on each one.
Mayor - in City Hall (NOTE you must use Cup A Fart for the fart to hit her)
Father Maxi - on a bench in front of City Hall
Principal Vic - in the Community Center (must progress in the story far enough)
Prime Minister - *missable* found in a cave in Canada. If you don't fart on him here, he's gone and you'll have to start all over
The achievement should unlock after farting on the Prime Minister. It is highly recommended to use the Cup A Fart on every person listed above to ensure that your farts count as hitting them.
Make sure you stand in front of the Mayor's desk and use the Cup-A-Spell fart and throw it in her face. (this is the one I missed even though I farted on her 100 times with Dragon shout). The Prime Minister is miss able. Make sure you fart on him BEFORE you talk to him or else he will disappear.
Dammit, I really wish these achievement descriptions were accurate. Description says "Prime Minister", yet the character in the game is named "Minister of Montreal". Same BS as "Hit" three enemies with a fart outside of combat, when in actuality it should read "Kill" three enemies with a fart outside of combat. Will have to get on playthrough 2.
#5 - innit!! not gonna lie, quite happy I wasnt the only mug that happened to tho, I am absolutely loving the game but the amount of missable cheevos and items is quite annoying. Especially as u get so far in, forget ooonnne bloody item and ur fooked! Ow well, better be more careful round 2.
Video-guide of South Park: stick of the truth to get the achievement or trophy Truth to Power.For this you have to fart on Father Maxxi, Principal Victoria, the Mayor of South Park and the Minister of Canada. This achievement or trophy is a bit bugged and problably you'll have to repeat with the President untill it pops up.At the beggining of the video I speak in Spanish but it's just and introduction and I don't say anything relevant.