This guide contains information to help you obtain the following achievements...

• 
  Cocktail

  collect 10 fruit
• 
  Salad

  collect 25 fruit
• 
  Super Juice Legend

  Collect all fruit

...as well as unlock the final console, which is required for 2 other achievements.
(See also: 100% Achievements Guide)

The secret specials (fruit) are collectibles well hidden throughout the game. They are hard to find (as opposed to special gems that are in every level), and finding all 56 of them is very difficult, because the game shows only which levels you've already got them in. There is also the stats screen which just lists the fruit in no particular order.

It can be quite tedious to follow such a guide. I recommend you to play the game, trying to find as many specials as you can on your own.

When you think you won't be able to find any more collectibles, you can look at your specials stats screen and match it with the following table of contents:
You can find the numbers of secret specials that you don't have. Let's say you want to find the red candy cane that has the number 31. You simply search this page (Ctrl+F) for "[31]" (without quotes).
You can also look at the list of all levels and match it this way.

This guide is separated into sections that correspond to consoles. The consoles that are not mentioned don't have any fruit.

Each section has multiple entries:

The level number lets you quickly find the level on a level selection screen; they are positioned in the following way:And the number in square brackets refers to the table of contents above.

Then one or more screenshots follow. They show a sequence of actions required to get to the collectible. The last screenshot (even if it doesn't contain a fruit because I couldn't capture it) shows the character at, or very close to the location of the fruit.