There are 5 Gun Challenges in Crimson Desert. They are part of the Mastery Category. Finishing all Gun Challenges unlocks the Master of Firearms trophy & achievement.
Note that all these challenges must be completed as Damiane, as she is the only character who can equip firearms. Damiane is available to be played as for a few chapters starting in Chapter 3 once you set up camp at Howling Hill, then becomes unavailable in Chapter 5. She then becomes available to be played as permanently starting in Chapter 9.
Challenges Overview:
When Lightning Strikes 1
- How to Unlock: Pick up Sealed Abyss Artifact in Crimson Desert, at intersection northwest of Left Eye Watchtower.

- Challenge: Take down 5 enemies from over 30 metres away using a gun.
- How to Complete: Kill 5 enemies total by hitting them from a long distance of over 30 meters. You can put a map marker at their approximate location to see the distance on the minimap. For this and the other challenges that don’t specify enemy types, they are very easy to complete by shooting the groups of flying mechanical bugs that can be found in the northwest or southeast of Delesyia.
- Reward: 1x Abyss Artifact, 1x Shred II
When Lightning Strikes 2
- How to Unlock: Pick up Sealed Abyss Artifact in Crimson Desert, at intersection southwest of Sanctum of Renunciation.

- Challenge: Take down 3 enemies with a gun from over 5 meters away within 5 seconds.
- How to Complete: As stated, defeat 5 enemies from over 5 meters away within 5 seconds. This is very easily done against the mechanical bugs in Delesyia, as they will be destroyed with one shot from any level of gun. Use Focused Shot and mark a bunch of them in a group to do this quickly.
- Reward: 1x Abyss Artifact, 1x Insight II
When Lightning Strikes 3
- How to Unlock: Pick up Sealed Abyss Artifact in Crimson Desert, on side of road northeast of Saltroad Trading Post.

- Challenge: Hit the target three times within one second using a pistol.
- How to Complete: This requires using Focused Shot to be able to fire quickly enough, but you can mark the same enemy 3 or more times and then release Focused Shot and Damiane will fire that many times in a row in quick succession.
- Reward: 1x Abyss Artifact, 1x Swift I
When Lightning Strikes 4
- How to Unlock: Pick up Sealed Abyss Artifact in Demeniss, on the side of the road south of Tariv in the forest path.

- Challenge: Hit 7 mounted enemies with a gun while riding a horse.
- How to Complete: Currently this specifically requires hitting enemies mounted on horses, it does not count against any other enemies on mounts, such as the Black Bears who ride bears or the enemies in the Crimson Desert on lizards or wolves. Because of this you effectively have to force it by attacking friendly NPCs and causing them to become hostile. Currently the best location to do this is at Thornbriar Fortress in southern Demeniss, in Chapter 9 after you can freely play as Damiane again. The area was automatically liberated during the story in the prior chapter, and now you can find many soldiers riding around the area on horses. To cause them to become hostile, ride up to them and continually swing your melee weapon near them, which will eventually be counted as the crime of “threatening”. The friendly NPCs will then start to become hostile if you hit one of them, and the ones on horses will start to attack you. Make sure that the NPC on the horse has drawn their weapon and is showing a red dot on the minimap, then you can shoot them to knock them off their horse, which counts toward this requirement. This doesn’t all have to be done at once, but you will continually gain bounty by doing this, so doing all 7 at once then paying off your bounty at a Church is the easiest method.

- Reward: 1x Abyss Artifact, 1x Faded Abyss Artifact, 1x Aptitude I
When Lightning Strikes 5
- How to Unlock: Pick up Sealed Abyss Artifact in Hernand, at intersection northwest of Ruined Chapel.

- Challenge: Take down 3 enemies each with regular, Evasive or Focused Evasive, and aerial shots.
- How to Complete: As stated, you need to defeat a total of 3 enemies each with normal shooting, either type of Evasive shot, and aerial shots. Aerial shots count as any shot you make while in the air, so you can more easily do this by using Focused Shot in the air and quickly mark enemies.
- Reward: 1x Abyss Artifact
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Jerry says
I found out that you have to hit and defeated friendly mounted guards with a hand cannon or gun actually counts toward your progress. Regular enemies won’t count. And for the 30m challenge you need to have excatlly around 30- 34M(above 35 won’t count, I try it for an hour)。The location I did those two challenge are Thorn briar Food storage ,North east of the word “steel mountains” on the map