A a detailed guide to collecting all of the newly available Shadowkeep weapons from the Lunar Rover collections badge. This will explain the different methods to receive the quests, and describe where to go to complete the steps needed to earn each available weapon.
To start, I should say that you will receive at least one of the weapons during a separate quest for Eris Morn after you complete the main campaign. Besides that, you will be obtaining the weapons through randomly dropped quests. I have received these by completing story missions, lost sectors, and collecting Helium Filaments. While I can’t say it’s consistent, I can say that they drop often enough that you won’t find yourself having to search for them by the time you complete the main Shadowkeep quest line. It is also worth mentioning that you can reacquire the quests once you have completed them, if you want to grind for a better perk roll.
All of the weapon quests have very similar steps to finish them; completing activities on the moon, getting a certain amount of kills, and collecting a weapon part from a specified location on the Moon. The following list will provide a simple, comprehensive outline detailing how to obtain each item, per quest and weapon name.
Quest: Essence of Vanity
Weapon Name: Tranquility
Type: Sniper Rifle
Complete 50 Activities (Patrols/Public Events/Lost Sectors) on the Moon
Defeat 25 enemies with a Sniper Rifle
Weapon Part: Collect the Horned Wreath in the Chamber of Night (Location Credit: Esoterickk)
Quest: Essence of Failure
Weapon Name: Arc Logic
Type: Auto Rifle
Complete 50 Activities (Patrols/Public Events/Lost Sectors) on the Moon
Defeat 50 enemies with an Auto Rifle
Weapon Part: Collective the Captive Cord found in the Lunar Battlegrounds (Location Credit: Esoterickk)
Quest: Essence of Greed
Weapon Name: A Fine Memorial
Type: Light Machine Gun
Complete 50 Activities (Patrols/Public Events/Lost Sectors) on the Moon
Defeat 25 enemies with a Machine Gun
Weapon Part: Collect the Ethereal Charms found in the Temple of Crota (Location Credit: Esoterickk)
Quest: Essence of Brutality
Weapon Name: Loud Lullaby
Type: Hand Cannon
Complete 50 Activities (Patrols/Public Events/Lost Sectors) on the Moon
Defeat 50 enemies with a Hand Cannon
Weapon Part: Collect the Necromantic Strand found in the Hall of Wisdom (Location Credit: Esoterickk)
Quest: Essence of Jealousy
Weapon Name: Night Terror
Type: Sword
Complete 50 Activities (Patrols/Public Events/Lost Sectors) on the Moon
Defeat enemies with a Sword (Number unknown)
Weapon Part: Collect the Ralniks’ Hatchet found in Traitors Ketch. This will drop from a Fallen Captain that you will find in the area (Location Credit: Ninja Pups)
Quest: Essence of Insanity
Weapon Name: Love and Death
Type: Grenade Launcher
Defeat 100 enemies with a Grenade Launcher
Weapon Part: Collect the Bound Manacle in the Gatehouse (Location Credit: Ninja Pups)
Quest: Essence of Obscurity
Weapon Name: Every Waking Moment
Type: SMG
Complete 50 Activities (Patrols/Public Events/Lost Sectors) on the Moon
Defeat 50 enemies with an SMG
Weapon Part: Collect the Withered Plumes in the Circle of Bones (Location Credit: Esoterickk)
Quest: Essence of Servitude
Weapon Name: Dream Breaker
Type: Fusion Rifle
Defeat 15 enemies with a Fusion Rifle
Defeat 100 Vex on the Moon
Weapon Part: Collect Ehrath’Ur’s Horned Wreath in the Catacombs (Location Credit: Esoterickk)
Quest: Essence of Rage
Weapon Name: One Small Step
Type: Shotgun
Defeat 150 enemies with Ability kills on the Moon
Weapon Part: Collect Fangs of Shun’Gath in the World’s Grave (Location Credit: WoW Quests)
Quest: ??????
Weapon Name: Premonition
Type: Pulse Rifle
It has been confirmed that to obtain this weapon, you will need to complete the yet-to-be-released Dungeon. We will update this article with details once they become available.