Any gear of any javelin can be used to complete this feat.
In any game mode, a maximum of 3 Gear Master feats can be earned. So multiple expeditions are required to complete this challenge. The feat will only count if it shows up in the Tracked Menu or if the expedition completed banner pops up.
The progress towards this challenge starts counting immediately after Pilot Level 2 is reached, and it passively completes itself over the course of playing the game.
Additional Notes and Trivia
The "Time remaining" mentioned is only meant to represent the maximum time for the challenge to be completed when it is available.
This challenge is always available, but may require progression through the story or leveling up to unlock.
To see the main pages that aren’t a part of the Cortex but a part of the Lore, see below: