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So I was trying to find a list of all the duplicate recipes. In other words, Products that could be made multiple ways (Zombie = Corpse + Life and Zombie = Corpse + Necromancer). I figured I had to have done all the recipes that were unique or only had one way of making them (Absinthe = Alcohol + Grass) in order to beat the game. The only recipes I could have missed were ones that the product was duplicated.
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So I took the list from the Steam source in Kiarinha Nyo's solution and made my own spreadsheet.
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http://www.trueachievements.com/viewcomment.aspx?commentid=929438#vch
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http://steamcommunity.com/sharedfiles/filedetails/?id=536365974
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This spreadsheet has a tab for all of the duplicate recipes in the game sorted by Product name and Episode, all the unique recipes in the game sorted by Product name and Episode, all the recipes in the game sorted by Product name and Episode, and then all the recipes in each individual episode sorted by ingredient names.
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So if you complete the game and this still hasn't popped, try the list of all the duplicated recipes first. I tried to list any recipe only once that make multiple products. For example, Bird = Bird + Bird is only listed once even though Bird + Bird really makes Bird + Bird + Egg, so Egg = Bird + Bird has been removed. I might have missed removing some. If I did, please let me know and I'll update the spreadsheet.
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If you do all of the duplicated recipes and the achievement still hasn't popped, then you might have missed a unique recipe and should do those next.
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As reported on many comments, NO QUEST ITEMS ARE NECESSARY FOR THIS ACHIEVEMENT. I can confirm this myself, I only completed one quest when I had this achievement pop. By my count, there are 369 total recipes in the main game and those are the only ones you need.
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Good luck!
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Solutions on TrueAchievements.com
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http://www.trueachievements.com/viewcomment.aspx?commentid=956306#vch
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