Fable II

this is easy to get, first of all buy a house any house and rent it out to some one. Now change the rental price to either -60% for pure or +100% for corruption. Now save your game and go back to dashboard, once your in the dashboard sign out of xbox live and change the date to one year later. now start up fable 2 again and it will unlock when you load your save.

Change the houses you are renting to +100% rent. No dashboard trickery should be necessary. I changed a few houses in Bowerstone one evening, and came back the next to 100% corruption.

Good luck building it back up though.

Just buy shed loads of beer from Bowerstone market and drink it all. Easy.

Alright, I tried all of the solutions above and no luck. I could never get fully corrupt even after setting the rent high, drinking a lot, sleeping for weeks at a time, and eating fatty foods. I basically looked like a fat devil but the corrupt meter hit a point and would not go up.
THIS IS WHAT I DID AT IT REALLY TOOK 10 MINUTES!!!!

Took all the rent that I had at +100% and moved it to -60% for businesses and -100% for houses (they were living rent free)

After about 10 minutes I had the achievement.

From this I would say that going pure is a lot easier than going corrupt

Easy buy houses or stalls and raise the rent too 100% youl be corupt in no time less then ten minutes if you buy all of bowerstone market.

I got it by using a second controller and using my previous gamertag as a henchman. So basically it will work if you invite a maxed out ish player into your game

*This method only works for the Xbox 360, as the offline date switch won't work for the BC version as it requires the profile being online to validate the licenses to run the game.*

Try purchasing and renting out properties in Bowerstone. You can buy some cheaper properties in Bowerstone Old Town to save money. Set your properties' rent value to the max. After that, save your game once you bought around 20 or more properties and changed their rent values to the max. Exit out of the game to the dashboard. Disconnect from Xbox Live by doing things such as unplugging an Ethernet connection being used as the internet on your 360. Now go to Settings > System Settings > Clock, and then change the date to the max (12/31/2025). Relaunch Fable II, then continue your save file. You'll have a wad of cash in your inventory. If it doesn't unlock, keep buying and raising rent values with your money. If you still don't have the achievement by now, save your game, then switch your date to the minimum this time (1/1/2005), relaunch Fable and open save, then save the save file then quit the game and switch the date to the max.

This method is best done if you weren't too much pure in your save file. When I did this achievement, I was a bit pure, so this achievement unlocked much faster than being almost pure to unlocking this achievement in a different way than trying to be corrupt when you're almost pure to the max.