What We Left Behind is one of the earliest missions given by Tian Wen in ARC Raiders, and it serves as a soft introduction to how multi-run quests work in the game. Like many early ARC Raiders quests, it requires players to complete objectives across multiple regions rather than in a single deployment. While the combat itself is fairly manageable, several steps can be confusing due to vague directions and environmental storytelling rather than explicit markers.

This guide provides a step-by-step walkthrough of the What We Left Behind quest, including exact locations, extraction tips, and a detailed breakdown of the weapon attachment rewards-plus which weapons benefit the most from them.

Quest Overview: What We Left Behind

The quest consists of three objectives, each completed on a different map:

·Buried City

·Dam Battlegrounds

·Spaceport

You don't need any special gear or consumables to complete these objectives. To minimize risk, you can safely use a free loadout for all three runs, making this an ideal early-game quest with strong rewards and zero investment. This also allows you to preserve higher-value ARC Raiders Items for later missions.

Once all objectives are complete, return to Tian Wen to receive a set of Tier II weapon attachments, which remain useful well into mid-game progression.

Objective 1: Parking Garage - Buried City

Start by launching into Buried City. After spawning, head toward the Parking Garage, located roughly in the center of the map near the Hospital landmark.

Step-by-Step Instructions:

1. Enter the Parking Garage and locate the elevator.

2. Interact with the elevator to breach it.

·The breach works on all floors, but the ground floor is recommended since it has fewer environmental hazards like Pops or Fireballs.

·After breaching, take the zipline downward.

·Close doors behind you to slow down any Raiders who may follow.

·At the bottom, you'll find a Raider Camp.

·Search two containers inside the camp to complete the objective.

There is also a chance for a weapon crate to spawn here, which can drop Purple rarity weapons, making this location worth looting even beyond the quest requirement.

Extraction Tip:

Once finished, jump out through the nearby window, turn right twice, and head down into the metro station, which provides a relatively safe extraction route.

Objective 2: South Swamp Outpost - Dam Battlegrounds

For the second objective, deploy to Dam Battlegrounds and head toward South Swamp Outpost.

This area features a structure shaped similarly to a silo, which is where your objective is located.

Step-by-Step Instructions:

1. Enter the South Swamp Outpost.

2. Look for one of the open gaps around the structure-there are several ways inside.

3. In one corner of the building, you'll find an interactable item.

4. Interact with it to complete the objective.

This section is straightforward once inside, but the multiple entry points can confuse players into thinking they're in the wrong building. If it looks like a silo, you're in the right place.

Objective 3: Container Storage (Bilgunn's Hideout) - Spaceport

The final objective takes place on the Spaceport map, specifically near Container Storage, also known as Bilgunn's Hideout.

Step-by-Step Instructions:

1. Spawn into Spaceport and move toward the right side of Container Storage.

2. Look for a broken section of the wall that allows you to cross over from either side.

3. You can also climb up the wall here, but be cautious-this route leaves you exposed to sniper fire from enemy Raiders.

4. Locate the metal container mounted on the wall.

5. Find the ladder, climb up, and grab the notes.

Once the notes are collected, you can extract them immediately. This completes the final objective of the quest.

What We Left Behind Quest Rewards Explained

After turning the quest in to Tian Wen, you'll receive three Tier II weapon attachments. These are versatile upgrades that work well across multiple weapon archetypes.

Muzzle Brake II

Best Weapons:

·Renegade

·Bettina

·Kettle

This attachment helps reduce recoil and improve sustained fire accuracy, making it ideal for automatic or high-fire-rate weapons.

Vertical Grip II

Best Weapons:

·IL Toro

·Vulcano

·Arpeggio

·Hullcracker

Vertical Grip II is excellent for controlling vertical recoil, especially on harder-hitting rifles and heavy weapons that struggle with stability during prolonged engagements.

Stable Stock II

Best Weapons:

·Stitcher

·Osprey

·Rattler

·IL Toro

Stable Stock II improves overall weapon handling and steadiness, benefiting mid-range and hybrid weapons that rely on consistent tracking rather than burst damage.

Final Tips and Takeaways

·Run free loadouts to avoid unnecessary losses.

·Close doors and use terrain to reduce PvP risk during objectives.

·These attachments remain relevant beyond the early game, especially for players experimenting with different weapon types.

·Completing quests like this early reduces the need to buy ARC Raiders Blueprints later.

·The quest is more about navigation knowledge than combat difficulty.

What We Left Behind is a great early ARC Raiders quest that teaches map awareness while rewarding players with genuinely useful gear. Complete it early, and you'll have a solid foundation for future missions and firefights.