There are 10 achievments that you can get in Nathria raid. When you will complete all achievements, you will get reward Rampart Screecher

 

Blind as a Bat
Defeat Shriekwing after she kills six Sneaky Servitors in Castle Nathria on Normal difficulty or higher.
In Shriekwing's room there are 6 Sneaky Servitors around the edge of the room. They are stealthed and can be seen by Demon Hunters with Spectral Sight, also try with Hunters with their ability, and there is a pile of poop on the ground where Sneaky Servitors are. They are unattackable but take damage from the blood puddles left by Earsplitting Shriek and Echolocation. Once they die they'll be visible and you need to kill all 6 them to get the achievement.

 

Taking Care of Business
Defeat Huntsman Altimor after walking Margore, Bargast, and Hecutis to the corners of The Kennels in Castle Nathria on Normal difficulty or higher.
Grab each beast as they spawn and walk them to the nearest wall, then walk them in a lap around the room. One as when you complete one of the adds' laps, they will drop a pile of poop. When you have 3 piles of poop you can kill the boss.

 

Burning Bright
Redeem Kael'thas after lighting all four of the room's braziers in Castle Nathria on Normal difficulty or higher.
There are 4 braziers in 4 corners of the room and each needs to be hit by a specific ability to light them.
Embered Brazier - hit it with Ember Blast
Blazing Brazier - hit it with Blazing Surge
Fiery Brazier - hit it with Fiery Strike
Smoldering Brazier - hit it with an ability that causes Smoldering Remnants
Once all 4 Braziers are lit, continue the fight as normal and kill the boss.

 

Private Stock
Defeat Artificer Xy'mox after returning loose Maldraxxus, Ardenweald, and Maw Anima to their display cases in Castle Nathria on Normal difficulty or higher.
First, you need to collect the three bits of loose anima just outside the boss' room. Clicking on the Anima will give you a buff, Maldraxxus Anima, Ardenweald Anima, or Maw Anima. Depending on the phase the boss is in, the Anima's buffs will be removed and he will be teleported to the middle of the room. When the Anima is removed, it will also create a zone on the ground to which whoever grabs the Anima from the middle of the room must run with it. However, when you pick up an Anima in the middle of a room, you are permanently stunned until you put it down. This means that after it is lifted, the next set of portals should fall on the player who clicked the Anima and the deposit point respectively, which will teleport the Anima holder there, and return it to the display case.

 

Feed the Beast
Defeat the Hungering Destroyer after draining all of the large anima canisters with Volatile Ejection in Castle Nathria on Normal difficulty or higher.
There are 3 anima tanks on each side of the boss room. You have to hit each of them with Volatile Ejection to break it. There's no time limit so it's okay if you break one at a time or even miss them entirely. Pull the ledge aside first, break 3 canisters there and then after you put the siphon on, go to the other side and break the rest 3. However, there is no range limit for them so you can break any canister from anywhere.

 

I Don't Know What I Expected
Defeat Lady Inerva Darkvein after defeating the Dark Animus in Castle Nathria on Normal difficulty or higher.
Bring the Son of Animus pet and he will receive a 4 minute buff that will make him completely immobile while he collects anima. Just wait for that time, and after that kill the boss.

 

Pour Decision Making
Defeat the Council of Blood after throwing four bottles of wine in Castle Nathria on Normal difficulty or higher.
Friendly Belligerent Waiters will run out of the side gates and stand next to the push back gargoyles during the fight, approximately every minute, and stand there waiting for about 15-20 seconds. You need right click four times on it to complete the achievement.

 

Dirtflap's Revenge
Defeat Sludgefist after he collides with pillars in Dirtflap's preferred order in Castle Nathria on Normal difficulty or higher.
When you leave Shriekwing's (also Sludgefist's) room out the right door and down a hall there's an imp mob named Dirtflap. Talk to him and he'll run to Sludgefist's room and climb on a pillar. You should hit this pillar first. After you do, he'll jump to another pillar. Repeat that movements until the boss will defeat.

 

Feed Me, Seymour!
Defeat the Stone Legion Generals while all players are carrying a Bouquet of Blooming Sanguine Roses in Castle Nathria on Normal difficulty or higher.
First - clear the trash. After that everyone in the raid have to pick up the Wilting Sanguine Roses, that you can find on terrace. (Picking them up will give you a buff which despite not having a timer only lasts for 10 minutes. If you die, you lose that baff). In order to turn your Wilted Roses into Blooming Roses, you need to get the bleed effect from either Wicked Blade or Serrated Blade, both from General Kaal. While actively bleeding from either of these effects, your roses will gain 1 stack every 1.5 seconds. After 60 stacks (90 seconds) your roses will Bloom, and all you have to do now is live until the end of the fight and wait for everyone else to be bleed.

 

Clear Conscience
Defeat Sire Denathrius after removing Burden of Sin from all players before March of the Penitent is cast in Castle Nathria on Normal difficulty or higher.
When drawn, each member of your group gains 4 stacks of Burden of Sin. A total of 6 times in Phase 1, the boss will use Cleansing Pain, a frontal cone aimed at the current tank. Anyone struck will take some damage and lose 1 Burst of Pain. To remove all of your stacks, let each raid member hit 4 Cleansing Pains before the boss reaches 70%, which is when he casts March of the Penitent.