Participants will not be able to see Missions that they have not unlocked yet.
Missions will only become visible in the Mission list once the participant completes the Mission that unlocks them.
FAQ
Can participants see the Missions that one of their team members has unlocked?
Can participants see the Missions that one of their team members has unlocked?
Once a member of a team has completed a Mission that unlocks other Missions, all other team members will also be able to see the unlocked Missions.
If I delete a submission for a Mission that unlocks other Missions, will participants still be able to see the Missions they unlocked?
If I delete a submission for a Mission that unlocks other Missions, will participants still be able to see the Missions they unlocked?
For a rundown on how a deleted submission affects unlockable Missions, please refer to this article.