All Bosses Challenge - To unlock beat, individually, all bosses in Challenge mode
Any Boss Challenge - To unlock  talk to Sheik to learn the prelude of light and unlock this, then beat the boss to fight it in Challenge mode

Unlock Master Quest
Beat the game in Normal mode. Then, after the press start screen, you will be sent to another screen to select between Normal or Master Quest Mode
Master Quest - To unlock beat the game for the first time.

Elemetal Arrows
Fire Arrow       To unlock shoot the sun after the Water Temple
Ice Arrow         To unlock complete the Gerudo Training Ground
Light Arrow     To unlock beat all the temples, then talk to Shiek

Get a cow inside your tree house

  Complete the task listed to have a cow put in your tree house.
Cow in the tree house - After beating the race at Lon Lon ranch for Epona, race again and get the best time (49 seconds or below) to unlock a cow for your tree house. 

Skulltulas Unlockable
To get this unlockable items, you must kill the number of Skulltulas Spiders that is required. After you kill the skulltulas spiders, collect the tokens and then go to the Skulltula House in Kakariko Village to get your prize.
Adult wallet            10 Skulltula Tokens
Bombchus             40 Skulltula Tokens
Giant"s Wallet        30 Skulltula Tokens
Huge Rupee         100 Skulltula Tokens
Piece of Heart        50 Skulltula Tokens
Stone of Agony      20 Skulltula Tokens

Easter Eggs
Hidden Browser Broach
If you look at the broach that Marlon is wearing, you will notice that it is actually bowser"s face.

Hidden Secret in Hyrule Castle Courtyard
When you arrive in the Hyrule Castle courtyard, look at the left window. Now take out your slingshot and shoot the potted plant. Someone will yell at you to stop doing that, and they will also throw a bomb at you

Secrets
Free Hylian Shield
When you"re a kid you can get the Hylian Sheild for free instead of wasting 80 rupees. First go to the graveyard in Kakariko village and wait for night. Then pull the tombstones that have flowers in front of them back and go down their holes. When You find the right one it will have a treasure chest inside. Inside that is the Hylian Shield.

Free Masks At The Mask Shop
This won"t work unless you"ve already sold the Keaton mask to the guard outside of Death Mountain. Once you"ve done so, before getting the Skull Mask you can ask to borrow the Keaton Mask again for free. Once you"ve done so, leave the shop, go back in and ask to trade masks. You can trade the Keaton mask for the Skull mask (he"ll say you have to pay, but you won"t) for free! It even makes the sound of you giving him the rupees, but you"ll still have all your money. The same works for the Spooky mask and the Rabbit hood, you just have to trade the mask that you sold before it.

Get Fire Arrows Early
First, get the scarecrow song as a kid. To do this, go to Lake Hylia as a kid through Zora"s Domain. Talk to the scarecrow on the shore, the fist by the lake. Take out your ocarina and he"ll want to play. Play a song you made and that"s your song. Be sure to remember it. Next, you"ll need the Longshot. To get this, beat Dark Link in the Water Temple. As an adult, go to the scarecrows and play the song for the first one. Piere will now appear where there is a green Navi but nothing there. Now, when the sun is rising, shoot the sun with an arrow by the Water warp point (with the Water Medalion on it. When the Fire arrows appear, go down the hill. Don"t drop, just go to the edge. Play the scarecrow song to make Piere appear. Use the Longshot to hook on and grab the arrows. Good Job! P.S. The Fire Arrows light things on fire. Duh!

Get the golden scale as a kid!
When you are a child, go to the fishing pond and start fishing like normal. Keep fishing until you get a fish that’s big enough to earn a heart piece. Instead of going to the fishing owner, go into the middle of the pond. Face towards the owner in the water and hold Z + R (lock and shield). Don’t let go and swim and run to him. Once you reach him, talk to him without letting go of Z and R. He’ll give you the golden scale instead of a heart piece! This allows you to do many things early on. Such as entering Zora’s Domain without having to play Zelda’s Lullaby. Or getting the heart piece from the Lakeside Laboratory (letting you have both the scale and heart piece.)

Giant monsters
If you continously kill the same type of monster, you will encounter a giant version of the type you"ve been killing. This works on Stalchildren, Guays, and Leevers.

Kill Zombies Easier
Play the sun song anywhere where there are zombies. They will freeze and be easier to kill because they won"t attack you.

Never Lose Tunic or Shield 
To not lose your tunic or shield when you are eaten by a like-like, put on the kokiri(green) tunic and the mirror shield. Since both of these are one of a kind and can"t be re-bought,the like-like can"t eat them.

Sinking Lure
If you want to easily catch really big fish in the fishing pond without having to spend countless hours, then make sure you have caught the "lunker" fish as an adult and have obtained the gold scale. Now go to the fishing pond and you will find a new lure in one of three places: 1.) in the feeder creek, 2.) in the grass around the perimeter of the area, or 3.) on the log jutting out of the pond. Once you find this lure, try fishing with it. It is irresistible to fish, so catching a 20 pounder will be no problem. However, if you set any records by using this lure, the fish you have caught will be noted as illegal on the aquarium and at the record board in Link"s house.

DS/DSi Zelda: Ocarina of Time 3D Release Date 17th June 2011 Publisher Nintendo Developer Grezzo Genre RPG Adventure Rating 12+ Format 3DS Tweet Check out below for the most helpful cheats, achievements and unlockables for Nintendo"s new addition to the 3DS Market, Zelda: Ocarina of Time! Unlockables When you grow up, and before talking for the second time to Sheik on the Time Temple to learn the Prelude of light, she will tell you that in your home you can rest to revive past battles. That means you have unlocked Boss challenge to fight each boss in the game (after you had beat them in the story) in your house. To unlock the last challenge (all bosses one after another) you have to beat them all in the challenge mode.
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