The Elder Scrolls V: Skyrim Special Edition

To get this achievement you will have to become first a Vampire Lord (not a normal Vampire) to access the Vampire Lord perks.

To become a Vampire Lord you will need to start the Dawnguard quest called the Awakening and travel to Fort Dawnguard, located in the southeastern corner of the map, to the east of Riften.

When you progress the quest and escort the daughter home you will speak to Lord Harkon and he will offer to make the player into a Vampire Lord. This is your first chance to become a Vampire Lord( but you will have two more chances later on if you decline here).

The 2 spots where you can still become a Vampire Lord :

In the quest Chasing Echoes, Serana offers to turn the player into a Vampire Lord. This is because living things cannot normally enter the Soul Cairn.
After defeating Harkon and completing Kindred Judgment, the final quest in the Dawnguard questline, the player can ask Serana to make her/him into a Vampire Lord just do not let Serana become human as she will not be able to then.

If you will like to get this achievement out of the way and not be a Vampire Lord you could just make a save before you speak with Lord Harkon, become a Lord Vampire, and go on a rampage killing people/animals to get the perks.

While in-game push go to Magic and then down to Powers and on the Vampire Lord. Exit and push and you become the Vampire Lord. Now the Vampire Lord features 11 unique perks and two combat modes — Melee Mode and Blood Magic mode by clicking you can choose the mode you want. Consuming lifeblood through a power attack bite (from melee mode) or a Drain Life spell(red spell on the blood magic mode) allows new perks to be gained.

Feedings
Each new perk requires a few more feedings than the last. A total of 156 people (or animals) need to be fed to complete the entire tree.
Perks 1 2 3 4 5 6 7 8 9 10 11
Feedings 5 6 9 10 12 14 16 18 20 22 24
Total 156


Power attack bite
This attack can be used while in melee mode. It is performed when power attacks a humanoid with low health and happens only a percentage of the time. It activates an animation in which the enemy is bitten on the neck and killed. For this attack, you will need to count for upgrading the perk tree.

Drain Life
This spell is unlocked by default. Hold down to charge it and then release it. It is the core offensive spell in the Vampire Lord's arsenal and is permanently equipped in the right hand when in Blood Magic mode. It works similar to the original Vampiric Drain in that it absorbs the health, but rather than a stream of energy, it is an area-of-effect projectile similar to the fireball spell. Killing creatures or people with this spell allows new perks to be gained.



Also if you will like to just exit the Vampire Lord just click on the D-pad and choose the Revert Form and then click and you are back to your character (i was personally stuck and did not know how to get back lol ).

If you just wish to get the achievement out of the way fast then make a save and
-just ask Serana or Lord Harkon to make you a Vampire Lord
-travel to each Hold in Skyrim and start killing all from guards to horses as a Vampire with the Drain Life spell
-exit the Hold you are and just ran away till you do not have aggro anymore
-travel to another Hold and repeat (it will take maybe 3 or 4 Holds)
-put all 11 perks on the perk tree to get your achievement
-load your save

If you are wondering about the Holds in Skyrim those are:
Whiterun
Falkreath
Markarth
Dawnstar
Riften
Solitude
Windhelm
Winterhold
Morthal

Good luck and enjoy Skyrim on the One .

EDIT: Shomberlon commented that *Mudcrabs and Frost spiders have a 1-to-1 ratio for feeding. I found a good concentration in the river that runs from Markarth all the way down to the sea (over 20 in total) and 10+ in the river that runs past Whiterun. I think any large animal gives you a feeding point but I know 100% that the above 2 always give you one.*

Press ~ to open Console.
setstage DLC1vq02 20
coc DLC1VampireCastleGuildhall

Go straight and talk to Lord Harkin and accept the Vampire Lord.

Once you are in the Tutorial for the ability: Press ~ to open Console.
set DLC1VampirePerkPoints to 11

Apply points to perks.

open console [~] and type following:

player.addspell 0200283b
set dlc1vampireperkpoints to 11

close console. Go to magic menu and select vampire lord under powers. Use your shout button to transform, then access character menu and apply all the perks. Simple.