You can find your save file in

Local Disc C -------> User --------> "Username" ---------> App Data -------> Local

"Username" can be for example "Asus" or whatever you changed it to

Then find "Daedalic Entertainment" folder from there and then click on "Deponia"

choose "savegames" folder & remove all of it's content EXEPT "profile.dat"one

Note that you don't need to delete them just cut & paste them somewhere else outside of game's folder

Now go the Daedalic official website and download this one :

Droggeljug Achievement Bug (3.3.1356) – Savegames – Deponia[www.daedalicsupport.com]

You can directly go to Daedalic official website (Deponia page) by clicking on the text above

It's at the end of website. After downloading it, extract it to your save file location

Click on the left corner of your steam which is written "Steam" & click on "settings" now go to "Cloud"

Remove tick for "Enable steam Cloud Synchronization for applications which support it"

Now run Deponia, check the face appeared in your settings and load your save file

Once the game finishes and credit comes, you'll get the achievement.

Enjoy !