South Park: The Fractured But Whole has a total of 21 toilets that you'll need to use and complete in order to gain this achievement. Since many of them will require to use buddy abilities that are unlocked late in the game, it is recommended that you wait until the end of the game to mop them up. They are as follows:
[
0:03] - Your House
[
0:28] - Butters’ House
[
0:51] - Cartman’s House
[
1:12] - Stan’s House
[
2:05] - Kyle’s House
[
2:27] - Jimmy’s House
[
2:51] - Henrietta’s House
[
3:16] - Craig’s House
[
3:40] - Clyde’s House
[
4:03] - Kevin Stoley’s House
[
5:03] - Bebe’s House
[
5:27] - South Park Community Center - Men’s
[
6:07] - South Park Community Center - Women’s
[
7:07] - Park County Police Station - Men’s
[
7:51] - Park County Police Station - Women’s 1
[
8:12] - Park County Police Station - Women’s 2
[
8:29] - Freeman’s Tacos
[
8:55] - Big Gay Al’s House
[
9:22] - Nichole’s House
[
9:47] - South Park Mall Port-a-Potty
[
10:12] - Peppermint Hippo
Upon completing your first toilet, you'll also receive: