Infinite Undiscovery

You can get this achievement with either Aya, Rucha, or Dominica,(although this process will only work with Aya or Dominica) simply get either of their cooking IC to level 4.

This is easiest to do once you reach Port Zala on disc 2.

Buy fresh milk from Faina and make Oradian Butter until you reach Level 3. (2 Fresh Milk = 1 Oradian Butter)

Now go back to Faina and buy Wood Syrup and Honey and make Royal Jelly until you reach Level 4. (2 Honey + 2 Wood Syrup = Royal Jelly)

Note: Dominica starts at IC Level 3 so you don't have to do the first part if you are using her. Also I recommend going all the way up to IC Level 6 using the second part.

Use Aya's cooking skills to create new items. Get to IC level 4 for this achievement.

If you're spamming Smiley Charms to earn loads of Fol, you might as well use aya at the same time to create 100% Berry Juices, as they get some decent money for the cost of the Berry items needed to create them.

You can get this right after you finish the Dragonbone Shrine in Nolaan. Connect (RB when you're near her) with Rucha, and go down to the general store in Nolaan.

You should have at least a few thousand after doing the shrine - if you don't, sell anything the general store can sell you back, potions, medicine etc. you will get them back a million times over afterwards if you want :-)

Buy 98 red berries, and 49 blue berries. Camp (press back) with Rucha connected, enter Creation->Items. Use all of your berries to make 100% berry juice, and you will be at least IC 4 with Rucha.

Bla-bloop!

This recipe turns a $130 per potion profit, assuming none fail (but they will). So you can just keep cooking for money. Don't spend TOO long on this, as there are far faster ways to make money later on. If you had to sell things now you can buy them back.