From http://steamproxy.net/app/204220/discussions/0/846943082530138730/ :

Publicado originalmente por dcarrigg:

2. Where are my saved game files stored?
On Windows, they are saved in your Documents folder under a folder called Snapshot.
On OSx, they are saved in the directory with the game.
On Linux, the save game files are stored in .local/share/Snapshot, and as well as in .config

https://www.dropbox.com/s/1ikpzarvo60rcxc/snapshot_saves.zip?dl=0
(If the link is broken - PM me, i'll reupload it)

• Download savegames
  
• Backup your own savegame
  
• Replace your savegame "Snapshot" folder with "Snapshot" folder from desired percentage folder
  
• Copy userOptions.snap from your save folder (thx tiagotrigger for pointing out)
  
• Start the game, go LEFT from level 1-1 until you fall on the ladder, then go right to the final room
  
• As soon as you see ending pictures achievement should pop up
  
• ...
  
• PROFIT!!

Note: I didn't add 100% savegame, as it's not missable, and it's something you should earn by yourself.
Note 2: Most of savegames were manually edited, so i don't recommend using them after you earn missed achievements.
Note 3: You may accidentally get some other achievements, so use at your own risk.

Like and Favorite if I helped you, and have a nice day.