LEGO Worlds

I found a world with a gold dragon on it. Coordinates 154-979-545 galaxy letter F. Fly up to the clouds and jump on his back. Turn on a second controller and kill that player with fire balls from the dragon.

Hardest part is getting on the dragon. I used a helicopter to fly over him then lowered my self close enough to hit Y and land on him. It takes a bit of luck.

Once your on the dragon should be able to get the achievement in about a minute. This works as of 8/20/19 the other world listed in other guides are out of date and don't work anymore.

Edit: according to Sandwich Lady the gold cloud is at x 21.94 y 86.02 z-12.77 credit to them.

I got this achievement today really easily without doing all the quests.

I went to the world x23y86z-16 and looked for the gold patch on the map.

I used the Agents Heli-Pack to fly up to the gold cloud which is higher than the white clouds. I was able to fly near enough to the dragon and press Y to land on it.

I then turned on a second controller and joined as a guest.
Then use attack to breathe fire on the 2nd player a few times to kill them.
I killed the 2nd player 3 or 4 times before the achievement unlocked.

Update: This is pulled off of the Lego Worlds Wiki page. All credit goes to gandalfwhi40 for finding this:

To start, you'll need to Discover the Spooky Girl in her native Weird Woods and complete one of her tasks. (One beginning task is rebuilding her garden. You'll have to place some charred flowers, gravestones and a bunch of iron fences, all of which can be found in the Weird Woods. Another is to build a campfire site for ghost stories. The latter can be found on Harry-Mulligan-892/F at X:-14.41, Y:26.78, Z:-50.08) After this, she should be available to spawn in the swamps...

Next, go to the Lawless Lagoon and seek the Spooky Girl standing by some lab equipment (Try the Galactic Coordinates 163-193-103/D at X:-59.526, Y:27.072, Z:26.489). She will ask you to place a Cauldron (found in the Weird Woods) and two different kinds of glowing Cave Mushrooms (found in Cave Systems or in the Chemistry Lab Brick Build) nearby. Once you've done that, she'll want to trade you for a Pumpkin Head (which you can also find in the Weird Woods). In exchange, she'll give you a Red Crystal.

Next, it's off to the Crystal Crags to find the elusive Jewel Thief who will take that Red Crystal and give you a Dinosaur Tooth for it. She will NOT be marked by a quest marker, so just keep looking around for wandering Jewel Thieves carrying teeth.

Once you have her Dinosaur Tooth, it's time to trade it to someone who really wants it: The Dino Tracker. She's in the Rowdy Rainforest, so set your controls for a world with some jungle on it, and go tracking the Tracker! She should be wandering around somewhere, holding a Water Pistol! Trade her your Dinosaur Tooth, and get a new gun in the process!

Now to find someone who wants this nearly useless Water Pistol? Oh yeah - the Fisherman likes those, doesn't he? Does he?!. Anyway, head to any Biome with a Fisherman (Curious Canyon, Fungus Forest or Lawless Lagoon) and you should have no problem locating a Fisherman walking around carrying a mysterious-looking egg... Trade your gun for his Fire Dragon Egg, and you have unlocked the Dragon Wizard! He will now begin spawning in the Whispering Woodland as well as the Wicked Wasteland. Which, by the way is where you need to go next to continue the quest to unlock Dragons!

*The quest MAY be broken here Before completing the Dragon quest, you should try to unlock Dragon Eggs: Find a Dragon Wizard, and beat him into submission (remember to use a Crystal Weapon!). While subdued, he should be willing to accept the Fire Dragon Egg from before, at which point he becomes discoverable, and also (very likely) will start to attack you. Even if this part doesn't work, you can still continue on the quest, but it will block you from unlocking Dragon Eggs permanently (as of Title Update 3b).

You may need to hunt around or try different worlds to find one, but you must locate a Dragon Wizard standing at an Altar, holding a Crystal Scimitar. He will trade you his sword if you bring him four items: An Orange Crystal, a Yellow Jewel, a Red Gem and a Doughnut. ( Try this world, there are two altars: Everett-Chiu-878 zone G - coordinates X:35.79, Y:28.96, Z:109.83 or X:113.03, Y:29.60, Z:91.14)
This will not be enough, so bring on the familiars! He suggests spawning 4 Red Snakes and 5 Red Frogs.
STILL not enough... so try painting a nearby structure with some Lava texture?

When in doubt, Dance! The Dragon Wizard now asks you to build some Dance Pads and torches so that he can "bust a move" with the Fiery Fandango.
STILL no luck. Well, no Dragon can resist Fiery Frosting! (can they?). Anyway - time to build a giant Cupcake from your Brick Builds (the blueprint is called "Cupcake 5"). When you complete this stage, he gives you a Night Dragon Egg to go with the Fire one you got earlier, and Dragons will now begin spawning in their appropriate Biomes!

But what to do with these eggs? Simple! You hatch them by throwing them into the lava! Good thing for all the lava around, eh? Be careful where you throw it, because the egg will hatch IN the lava, and you will still need to feed the newborn in order to discover it and claim it for your own. You might have to paint the lava as stone in order to run onto it to pick up the baby, but after you do... You'll be the proud parent of a brand new Baby Dragon!

But what about the BIG Dragons?! Well, sadly, the babies don't grow up. Instead, you'll have to find a full-size Dragon, defeat it, then feed it, then it's all yours!
CONGRATULATIONS! You've completed the Quest to unlock Dragons, Baby Dragons and the Dragon Wizard.

Original Post:
The easiest way to unlock a dragon is by going to 741-318-963 in the F Galaxy. For the life of me, I could not get a dragon to spawn there. So I had to go about getting the dragon the hard way.

You will need some supplies before starting: a red jewel and two pumkin heads from the trader. Also, if you have the water gun in your inventory, sell it to the trader so that you can complete a quest later.

Firstly, you need to unlock the Dragon Wizard
You will need to be able to spawn green cave mushrooms, cave mushrooms, cauldrons, have a red crystal, and two pumpkin heads in your inventory before doing this. You can get the red crystal and pumkin heads from the trader at night.

You unlock him by doing a series of quests:

1)
You need to do a rare quest from Spooky Girl. Go to 112-338-30 in the x galaxy and travel south to a green dot to find her quest. You will need to have unlocked the green cave mushroom, cave mushroom, and cauldron. Complete her quest to receive the red crystal.

If you are having trouble finding spooky girl, you can also try:
Galaxy Coordinates: 163-193-103 D
Map Coordinates: X: -59.526 , Y: 27.072 , Z: 26.489

* Thanks to RadiantViper for the alternate Spooky girl quest location.

2) Create a huge world with us the crystal crags biome. Look for the Jewel Thief and trade the red crystal for the dino tooth.
3) Create a hug world with the Rowdy Rainforest and look for the Dino Tracker. Trade the dino tooth for a water pistol.
4) Create a huge world with just the Curious Canyon biome. Search for a fisherman and trade the water pistol for the dragon egg.
5) Finally create a huge world with just the Wicked Wasteland biome. Search for the dragon wizard and trade the dragon egg with him to unlock the dragon wizard.

Part two... Find the Dragon Wizard quest giver.
You will need to have unlocked the:
1) red snake
2) red frog = x12y34z56 3) dance mats = 735-480-123 in galaxy J ( Located by a green quest marker to
4) flaming torch
5) cupcake 5 blueprint

1) Load a new huge world with just the Wicked Wasteland biome. *This part was the most time consuming for me.* You have to make a huge world to be safe. Start doing every green dot quest on the map. Doing every quest will help you identify which quests you have checked. Eventually, you will find the Dragon Wizard quest giver. He wants you to give him a yellow gem, red jewel, doughnut, and orange crystal. He will then give you the crystal scimitar (used to defeat the dragon).
2) His next quest tasks you with making red frogs and red snakes. Use the discovery tool to spawn the requirements.
3) He will then ask you to paint lava.
4) He will ask you to lay some dance mats and flaming torches.
5) He will ask you to build Cupcake 5.

After building the cupcake, dragons should start spawning in your worlds. I had a fire dragon spawn close by. I attacked it and died horribly because I didn't use the crystal scimitar. I equipped the crystal scimitar, defeated the dragon, and paid 500,000 in game currency to unlock him.

ALL OF THIS AND YOU DIDN'T EVEN GET THE ACHEIVEMENT YET!!!

To get the gamerscore, simply add another player with a second controller, fire at him quickly with the dragon, defeat your guest player (you will receive an in game message on the second controllers screen saying they were defeated by you) and pop goes the achievement.

*I hope you don't have to use this method as the others are much easier. But if you get stuck like I was, try it out!

** if you are going to down vote me so any reason, please let me know why in the comments so I can improve this guide!

*** credit goes to wavy wanderers and base line for the youtube videos.

**** Happy Hunting!

coordinate for world is 741-318-963 F then go to x18.66 y85.56 z-16.71 for Dragon. Thanks to Skate 323 \(><)/

As of now, I have tried every guide/solution on TA and none of them seemed to work. I don't know if they're outdated or what, but the quests do not function as described and led to hours and hours of going nowhere and a lot of frustration. However, I was able to get this achievement by being invited to someone elses game who already had dragons unlocked. They spawned one for me to get on and I blew him up and I unlocked the achievement. I personally think your best bet, would be to find someone who has dragons unlocked and to have them help you this way. It takes about 5 minutes total. (after you find someone of course)

For those that still tries getting this achievement I've found a website and the coodinates still works. It took me only 5 minutes https://forum.psnprofiles.com/topic/66355-fastest-way-to-get...