God of War: Ragnarok - Niflheim Collectibles

Niflheim gets unlocked when you rescue Tyr and return back to your hub. You will unlock Yggdrasil seed quest and you will be able to travel to Niflheim at this point. This is the realm of Ravens, and basically you can return here to loot Legendary chests if you discovered and shot enough Odin's Ravens throughout the game.

The Raven Tree

Just in front of the teleport used to enter the area you will find all 6 Legendary chests. You will need a certain number of Odin's Ravens collectibles to open more chests. You need all 48 to open all chest and finish the The Eyes of Odin Favour.

• Legendary Chest 1/6: Girdle of Raven Tears (Waist Armour)
  Location: In front of the entrance teleport, before the Raven tree
• Legendary Chest 2/6: Bracers of Raven Tears (Wrist Armour)
  Location: In front of the entrance teleport, before the Raven tree
• Legendary Chest 3/6: Cuirass of Raven Tears (Chest Armour)
  Location: In front of the entrance teleport, before the Raven tree
• Legendary Chest 4/6: Breath of Thamur (Heavy Runic Attack)
  Location: In front of the entrance teleport, before the Raven tree
• Legendary Chest 5/6: Meteoric Slam (Heavy Runic Attack)
  Location: In front of the entrance teleport, before the Raven tree
• Legendary Chest 6/6: The Finger of Ruin (Heavy Runic Attack)
  Location: In front of the entrance teleport, before the Raven tree
• The Eyes of Odin 1/1
  Location: In front of the entrance teleport, before the Raven tree. Finish "The Eyes of Odin" favour (open all 6 legendary chests), and defeat the boss that awaits afterwards (enter the area where the sword is). Defeat The Raven Keeper + The Pale One that appears to finish The Eyes of Odin favour, and to get Dragon Claw x2, Hilt of Forsbrandr Relic, and Niflheim's Justice Amulet Enchantment.

Frozen Caverns

You end up here during your visit with Atreus and Thor. Nothing you collect during this run counts, so don't worry.

• Legendary Chest 1/1: Bitter Squirrel (Runic Summon) [Doesn't count towards 100%]
  Location: South from the Frozen Caverns letter on the map there will be a path to the left and right (right is a swing). Go left and open the chest.

Mist Fields

You can enter this location after you clear the area with Kratos - I returned here after beating the game.

• Nine Realms in Bloom 1/1
  In front of the starting gateway.
• Berserker Gravestones 1/1: Skjothendi The Unerring - Berserker's Gaunglets (Wrist Armour)
  At the end of the area, you can see the icon on the map

Aesir Prison Wreckage

You can enter this location left from the crow tree. I did this after beating the game, and Tyr will be at the bottom in the prison.

• Nornir Chests 1/1
  Inside the prison area.
• Legendary Chests 1/1
  Inside the prison area.
• Nine Realms in Bloom 1/1
  Inside the prison area, bottom floor.
• The Broken Prison 1/1
  Reach the bottom of the prison, where Tyr awaits.