Assassin's Creed Valhalla

WARNING: There is a challenge-breaking bug associated with the Trial of the Raven in Anderitum Hideout in Suthsexe. The key you need to loot from the fourth guard you encounter is only available during your first attempt at this challenge. In all subsequent attempts, he has no key, and it's therefore impossible to complete the challenge. You therefore need to make a manual save before attempting this challenge so you can reload it if/when you fail to get gold on this challenge. DO NOT rely on autosaves. Make a manual one before this challenge to fall back on.
 
Firstly, this achievement actually requires you to complete all Mastery Challenges with a gold medal from the first Mastery Challenge title update as well, so refer to A True Master (30G) if you haven't done those yet.
 
This title update adds a new quest that leads to three more shrine locations, with another nine challenges to complete. Each location has a melee, ranged, and stealth challenge, just like the first set of shrines. I have detailed each challenge below with the requirements to pay attention to, my own tips and strategy, and then lastly a video at the end of this solution that shows all challenges being completed with gold.
 
As with the previous set of Mastery Challenges, you may want to consider removing your skill that damages enemies when you parry them. While it felt quite essential to do it for some Bear Trials in the first batch, I didn't encounter any problems in these challenges while having that skill, despite needing to parry a decent amount. It's up to you if you want to remove it. I didn't find it necessary here like I did with the first batch.


Anderitum Hideout, Suthsexe

Trial of the Bear
Poison kills: Margin for error = 1 enemy. All enemies in this challenge must die from poison damage except one
Parry: Need around 10 to complete the challenge

As you can see from the requirements, you need to ensure virtually all enemies die from poison. While parrying has a chance to cause a poison cloud to appear, it's not very reliable. Your ability, on the other hand, automatically poisons everyone around you. The good news is that the poison and its effects on enemies seems to linger almost indefinitely, meaning once you poison enemies you could really just let them die over time. Get your parries done early, and then you can just use your ability on a group to poison them, hit them a few times each to build up more adrenaline, but then make sure to make off when their health gets low so you don't accidentally kill them. That's the main thing with this challenge - ensuring you don't accidentally kill enemies before they die from your poison. 

Trial of the Wolf
Weak points hit: Only need around half of the total available to complete this challenge
Poison kills: Margin of error = 2 enemies  

While your gear does allow you to poison enemies if you hit their weak points, this is a pretty rare effect and therefore one you can't rely on at all, unfortunately. Instead, the only reliable way to poison enemies is to parry them. Unfortunately again, unlike the Bear challenge, poison won't last long enough to kill them if they have most of their health left. My strategy for every enemy was to get their attention, parry them to poison them, then shoot their weak spot to bring them to their stunned state, and in this state they take far more damage from poison, easily allowing them to die from it. Worst case, parry them again if they get back up from being stunned. 

This works on every enemy except two: the two crossbow enemies at the end of the challenge, because they don't do melee attacks for you to parry. Thankfully, your margin for error is two enemies on the poison kills, so as long as you kill every other enemy with poison, you don't have to worry about the archers. However, it is still quite easy to poison them. Simply stand near them so a melee enemy attacks you while near them, and your parry poison cloud should get the archer too, poisoning him. 

Trial of the Raven
All chests must be looted, and there are only four of them, easily spotted with Odin Sight. For this challenge you must stay nonlethal and anonymous, and there is no way to stay nonlethal and anonymous in this challenge unless you avoid interacting with enemies entirely. You'll need to sneak from bush to bush in this challenge, getting each chest when the coast is clear, looting the key from the fourth guard (see important warning above for this), getting the prisoner from the cage, then back out the way you came in. It's a simple challenge that only really requires patience. If you rush you're likely to get spotted and need to start over. 


Saint Guthlac's Point

Trial of the Bear
Finish in under 2:00: Margin for error is around 10-15 seconds once you know what you're doing
 
This is purely a speedrun challenge, and there's absolutely no way you'll get gold without using your Valkyrie ability to jump right to the platforms with enemies. If you use the paths and ladders, you will never succeed. This one is pretty tough to explain in words, so refer to the video below to see how this is done. 

Trial of the Wolf
Simultaneous kills: Margin for error = 2 enemies
Weak points hit: Margin for error = 2 weak points

As you can see from the margins for error, this needs to be a pretty efficient run to get gold. This challenge is entirely small groups of enemies that you fight one group at a time. My strategy was just to hit each weak point first, to ensure I got them all, then whittle down the health of each enemy until it was around 25% or less, then run away enough that it was easy to target all enemies with the ability to ensure they were all simultaneous kills. If you accidentally don't kill one, just bait him to the next group of enemies and finish him off with them. 

Trial of the Raven
Air Assassinations: Margin for error = 0 enemies (must air assassinate all of them)
 
As you can tell from your loadout for this challenge, you'll be putting enemies to sleep, since they're often in groups, and then air assassinating them while they're asleep. Be patient and wait for enemies to group up who walk around, then put the group to sleep so you can air assassinate them without interruption. This one is tough to describe an approach in words, so refer to the video below to see this in action.
 
 
Uffentune
 
Trial of the Bear
Fire Damage Kills: Margin for error = 3 enemies
 
You've got two ways to set people on fire in this one: parry an attack and hope that it ignites your weapon, then hit an enemy with it, or use your + ability to ignite your weapon. Note that using this ability also sets all enemies on fire that are in front of you in your general area.
 
The important thing to keep in mind here is that you don't accidentally kill all the targets before you complete the challenge for fire damage kills, because you are likely to come across all four targets before finishing the challenge. Be sure to go around looking for more enemies to kill with fire. Killing them with fire is pretty simple in this one. You can parry all the melee enemies to save adrenaline for the firebomb enemies that rarely melee attack you. Use your ability for them, to either ignite them when they're near you or to just light your weapon on fire. Like all challenges that require element damage kills, just be very careful to not accidentally kill enemies with your weapon while trying to whittle their health down so the fire kills them. Thankfully this challenge has the biggest margin for error out of all of them.
 
Trial of the Wolf
Weak Points hit: Margin for error = 2 weak points
Headshot kills: Margin for error = 2 enemies
 
As you can see from the margins, you need to be near perfect with hitting weak points and headshot kills. Thankfully, this is the most straightforward challenge of the bunch. Just shoot an enemy weak spot (after a perfect dodge to slow them down, if need be), and then finish them off with a headshot while they're stunned. The headshots should kill them in a single shot while they're stunned. That's all there is to this one.
 
Trial of the Raven
Assassinations: Margin for error = 1 enemy
Indirect kills on targets: Margin for error = 0 targets (all four must die from indirect kills)
 
For this challenge, it's important to realize that the indirect kills only apply to the targets, not the regular enemies, and that all four targets need to be killed by indirect means. Indirect means include making cargo fall on their heads, shooting an oil vase to make it explode/setting them on fire, or death by an animal attack. A booby trapped corpse would also count, but it takes around four trapped corpses to kill a single target, so that's not really practical. Two of the targets can easily be killed be dropping cargo on their heads. Wait for them to walk up the obvious huge bundles hanging in the air, then shoot the latch to drop them for an instant kill. A third target just hangs out amount some explosive vases, and once you kill the enemies on the walkway around the area, the target just stands by the vases in isolation and doesn't move. Easy enough to shoot one. The explosion will do significant damage, and then the ensuing fire damage will finish him off. The fourth target walks in a rectangular path around a rectangular building, and stops periodically to look at animal cages. If you want to use the animals to kill him, first, wait until he is on the other side of the path before you shoot the doors to release the animal, otherwise you'll immediately be detected and lose your anonymity, and second, be aware that a single animal probably won't kill him; he'll likely kill the animal first, and you'll need a second to finish him off. My preference was to wait for him and the regular enemy to split up enough, then I assassinated the enemy and put the corpse inside the rectangular building in the middle, under the cargo, and booby trapped the corpse. When the target came to investigate, then explosion also blew up the nearby vases, and did enough damage that the resulting fire damage killed him. You could also use the corpse to bait him under the cargo and shoot it, but it's hard to get a good angle on the cargo latch without risking exposing yourself.
 
Of all of the normal enemies in the level, as you can see from the margin above, you need to assassinate every single one except one. Thankfully there are bushes and high points everywhere that make this pretty easy. Feel free to abuse the whistle tactic to lure enemies to the bush you're in, then finish them off. It should go without saying, but make sure you complete the Assassination challenge before finishing off the last target.
 
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Once you've completed all nine of those challenges, you'll get an updated objective to return to the door in East Anglia. Do so, and you'll enter a boss fight. This is quite straightforward. It takes the form of three phases, each representing one of the three types of challenges you've been playing. Here though, there is no way to fail and no medals, so just brute force your way through the enemies to get to the boss each time, then beat it by normal means (dodge/parry and counter attack).

With the boss beaten, a new shrine is available in the corner of the room you're in, only a few steps away. The final three mastery challenges await here. They are the same areas you just went through for the boss fight, same layout and enemies and everything, except with challenges to complete for the medal this time.


Dunwic

Trial of the Bear
Melee kills: Margin for error = 3 enemies
Parry: Only need around 7-8 total

The melee kills are the most important thing here, because if you follow the same path you took in the boss fight, you won't encounter enough enemies to complete the challenge. What I did was, after the second encounter with the boss, instead of following the corridor, turn off to the left to see an opening with a ladder leading down. There are three enemies at the bottom. Jump down, quickly kill them, then climb up to the platform and you'll need to drag the object over to the hay spot so you can reach the ladder to climb back up. Now you're free to follow the path like normal leading to the boss, and killing all the enemies on the way will ensure you finish the melee kills challenge. Obviously you'll need to be quick to keep the boss below 100% health, but I had no problems by just spamming light attacks against all enemies.
 
As for the parries, you can do them all against the boss very easily and quickly. Don't bother trying against the regular enemies. Just finish them off quick to get back to the boss.
 
Trial of the Wolf
Weak point hits: Margin for error = 2
Headshot kills: Only need around half of the enemies to die from headshots
 
Just like the boss fight, enemies will come at you one or two at a time. If you're getting swarmed, stay all the way back by the start point, against the barrier for the arena. I never had more than one or two enemies attack me at a time when I stayed back there. The other enemies just stood farther away waiting for their turn to attack.
 
The hardest part (the only hard part) about this challenge is hitting the weak point on the chest of those dual axe enemies. They tuck their heads, making it really easy to accidentally headshot them and kill them before hitting their weak point. They move so fast that even trying to hit their chest after a perfect dodge with the slowdown is a challenge. Thankfully there's a really easy way to ensure you can hit their chests: tire them out. After around three or four combos against you (simply dodge them), they will tire out and just stand there panting. Go off to the side (I found around a 45 degree angle from their front to be best) and carefully line up a chest shot to ensure you hit their weak spot, then finish them off with a headshot.
 
The headshots are very easy to complete here, because enemies only come at you one or two at a time, and each one can be finished off with a single headshot after stunning them with a weak point shot.
 
Trial of the Raven
Put enemies to sleep: Margin for error = 1 adrenaline bar (must put 5 enemies to sleep with six available adrenaline bars)
 
The only challenge here is knowing where to find enough berries to fill up your adrenaline bars so you have enough to put five enemies to sleep. Note that it doesn't need to be five different enemies. You could put the same enemy to sleep five times and it'll complete the challenge. It'd be too hard to explain in words where the berries are, so check out the video below. Note that the boss can spawn in one of three places, and it's random, so you won't be able to follow the video to get to the boss each time necessarily, but at least you can see where the berries are from the video, and use those adrenaline bars to put enemies to sleep on whichever path you need to reach the boss.
 
Once you've gotten a gold medal on all challenges (remember, including all challenges from the first Mastery Challenge update), this achievement will unlock. Below is a video showing a gold medal being achieved on all challenges from this second batch of Mastery Challenges. Full credit to the creator of the video.