The Elder Scrolls V: Skyrim Special Edition

So JamP0und32's solution is a great way to do it, but if your like me and don't feel like crafting the gear and having the right enchanting levels and potions and what not, save this for last. So on to how I did it relatively similar:

>Finish the Dragonborn DLC where we will be looking for a specific black book.
NOTE: You will need 11k gold, but by this time if you finished mostly everything else should have well enough.

>Go South East of Raven Rock to Kolbjorn Barrow
Map: http://elderscrolls.wikia.com/wiki/Kolbjorn_Barrow_(Dragonbo...)

>Talk to Ralis Sedarys at Kolbjorn Barrow to start the Unearthed Quest.

>First time you talk to Ralis Sedarys, he will ask for 1000 gold to get some miners. You must then wait 4 days. What I did was just go back to Raven Rock and wait 4 days. A courier should show up to deliver a message to continue the quest. If he doesnt show up, just fast travel somewhere then back to load him in.

>When you visit, you'll discover all the miners are dead and there is a draugr problem. Once they are all cleared out, Ralis will ask for 2000 gold this time.

Essentially you do this 4 times each with a unique problem, first is 1000, then 2000, then 3000, then 5000.

>After waiting 4 days after paying 5000 gold, you'll follow the marker down to a deeper part of the ruins where a dragon priest will raise and must be defeated. After defeating him you have access to the Black Book: Filament and Filigree.

>When done with the Black Book, take the Secret of Arcana power which will allow you to use spells for no mana cost for 30 seconds.

>Head to Redwater Den where you can find a Spell Tome: Telekinesis in a cell with a dead NPC.
Map:

>Now you got everything you need. Head to Windhelm or Markarth and keep fast traveling to each location when using the spell to go straight to lvl 100 Alteration. Drop an item down, (I used Clay, anything in Misc inventory should do fine) and equip Telekinesis on either
or . Equip Secret of Arcana and press . Use the telekinesis ability and then go to your map and fast travel to opposite city across the map. Now wait 4 hours and repeat the steps until you are at a desired level!

Hope this helps as I found this to be much easier!

Edit: I should note that I hit level 78 and went to all the dragon peaks / dragon symbols on the map to find a legendary. I ultimately found mine though in Arcwind Point
Edit2: As Orgaz put it, you do need to remember to make the 100 skill legendary so it resets to repeat the process

To have a legendary dragon spawning you need to be at least level 78, people have said they had them spawn at as low as 72 but it seems consistent at 78. If you are already at said level, skip to the bottom to see where to go to get one nearly every time.

This method is complicated if going for it straight out of the gate but if you've played the game for a bit you'll most likely have most of these steps done.

There are a number of ways to level up in this game but the easiest in my book is to abuse the Telekinesis spell. In essence you use the spell on an item then fast travel across the map, but first you need unlimited magica or a way to make the spell free. We will be doing the latter.

Firstly you will need to obtain the spell. An easy way to get it is to find it in Redwater Den.

It is found in one of the cells near a dead npc. If you can't be bothered to go there you can buy it from Tolfdir at the College of Winterhold. You will need an Alteration of 40 to do so. If you need to get that you can use the spell Candlelight or Magelight ( bought from most spell retailers. the guy in Dragonsreach for example ) Then use it until your magica runs out then wait an hour and repeat.

Next you will need to make your Alterations spells free. To do this you can enchant your items with Fortify Alteration. To get this you need to disenchant an item that has it. You can get this from a random loot drop or get it from the invisible chest in Dawnstar. Dawnstar chest shown here:
Credit to Christian Barkhuizen on youtube for the clip

Next you will need to get your enchanting skill high enough to be able to create a 20% Alteration Fortification enchantment. There are many method of doing this, using the above chest you can get lots of iron and keep crafting Iron daggers and enchanting them. Around 70-80 should be enough, if you have an enchanters potion that will temporarily give you a small boost.

Once you have that you're almost there. Now you can enchant 5 items with that giving you a 100% discount. Now there are only 5 items you can craft with this enchantment and they are as follows: Any ring, any necklace, any chest armour, any circlet and a Falmer Helmet. If you don't have a circlet it is a random loot spawn or you can buy it from Radiant Raiment near the main gate inside Solitude. The other one you need is a Falmer helmet, this is because you can wear this over a circlet unlike other helmets. It is a random loot or you can get a guaranteed one from Alftand Animonculory, which is the second area ( I believe ) inside Alftand. You go to Alftand as part of the quest Discerning the Transmundane. for Septimus Signus. Located here:
https://photos.app.goo.gl/NS8thwCrlpa5Demi1

Now you have everything you need. Go to Markarth or Windhelm and drop an item, any small item will do.( FullMoonBeaver states "Right, tried this again, but I fast traveled between Markarth and Winterhold instead. This worked for me, so try this if With dhelm isn't far enough for you." Now cast your Telekinesis spell on it and open up the map while casting, travel to the opposite city from above. Your alteration will be 100, make it legendary and repeat until you feel like you're a high enough level.


Now travel to Arcwind Point located here:
https://photos.app.goo.gl/DXhWQonnuHqWEnaa2
Now if you did this from a low level you're probably going to be underpowered so pack a lot of potions. There are a lot of Draugr's over there including a Deathlord who can kill it for you. All you need to do then is go over and get its soul and the achievement will unlock.

Press ~ to open Console.

tgm

Optional, if you don't want fight to take too long:
player.advskill onehanded 999999999
player.advskill lightarmor 999999999
player.additem 00240d2 1
player.teachword 44251
player.teachword 44252
player.teachword 44253
player.forceav dragonsouls 3

Equip weapon, level up skills, apply Dragon Souls and learn/equip Shout appropriately.

player.setlevel81

Complete up to the halfway-ish point of the fourth Main Quest:
setstage mq101 900
setstage mq102 160
setstage mq103 190
setstage mq104 65
coc whiterunwatchtowerexterior

Kill the story related Dragon.

coc whiterundragonsreach

Talk to Jarl until to get all of the quest scripting stuff out of the way; you should be good when you start The Way of the Voice. Dragons should now appear naturally in their respective Dragon Lairs.

Fast Travel to a Dragon Lair and kill a Legendary Dragon (if its not Legendary, go to a different one or come back at a later time.)

coc dragonlairexterior06exterior

Use the Shout and your OP stats to kill the Dragon quickly.

Just reach level 78 and then make a savegame and fast travel to one of the Dragon lairs
http://elderscrolls.wikia.com/wiki/Dragon_Lairs, if there is no Legendary just reload the savegame and fast travel to the Lair again until you see one (I got one on the 2nd attempt)

Just a heads up in case anyone has the same issue I had.
I reached level 78 playing on Expert and fast travelled to dragon spawn locations and still couldn't get a Legendary dragon to appear.
If this happens what worked for me was turning my difficulty up to Legendary and fast travelling again to a dragon location and finally a Legendary dragon appeared. Then you can turn your difficulty down for an easier kill once it's spawned if the dragon gives you a hard time

Pressing ~ will open the console command window. (top left under ESC)

Set your level high by typing:

player.setlevel 100

Then you will need to progress in the story by typing the following commands:

setstage mq101 900
setstage mq102 160
setstage mq103 190
setstage mq104 65

Head to the whiterun watchtower using:

coc whiterunwatchtowerexterior

Once the dragon starts flying towards the tower and is pretty close type into the console:

killall

The dragon should land and immediately die, Just wait around for a few seconds to make sure the story progresses.

Next go speak with the jarl:

coc whiterundragonsreach

The jarl will talk for awhile so just wait around until the quest "The Way of the Voice" starts. (Would recommend a save)

Legendary dragons will now spawn, a good location is:

coc ArcwindPointExterior01

Down the path should be a legendary dragon sat on a structure (If not then load back to the save and try again) Once it sees you and is attacking, you want to once again type:

killall

The dragon should land and die... This is where the achievement popped for me.

Hope this helps.

Like the others said yes level 78 is when legendary dragons spawn but, there is one location for a guaranteed spawn. When your level 78 it’s at Arcwind Point it’s just West of Rift Imperial camp.

If you haven’t discovered the camp it’s just East of Autumnwatch Tower

Press ~ to open Console

player.teachword 040179D9
player.teachword 040179DA
player.teachword 040179DB
player.modav dragonsouls 3

Use the dragon souls to unlock the 3 words of the Bend Will shout
(Use R to unlock the words)

player.setlevel81

coc MountAnthorExterior01

As soon as the dragon appears use the command
killall

Use the Bend Will shout on the dragon and it will die as soon as it lands
(z is the default use button)

Credit to LaMaXxXFleey for saying that Mount Anthor will spawn legendary dragons if the player is above level 78

this cheevos might been patched,even you use killall commands 22/08/2022 i wrote