mariohobbs
Modder
Moon Maker
Swingin' on a Star
Atlas
Biker Mice from Mars
ET phone home
Voyager Quest
Floater
Registered
with the recent-ish addition of the challenge log (its been like 6 months) it can be quite frustrating doing an entire mission, recovering the object and then just getting some seemingly random challenge logs, and only for challenges not filled out so here's some ways to get the mission log.
Destroy Rocket
If you have a rocket anywhere that isn't the earth's surface you can press the destroy rocket button to get the mission log.
Recover Rocket
If you have a rocket on earth's surface with a heat shield on it, you can detach the heatshield, press the recover button, then "View flight log" to find your mission log.
If say you have a shuttle or something that you are recovering then find a way to get debris from it, else there is no way to get your mission log.
Destroy Rocket
If you have a rocket anywhere that isn't the earth's surface you can press the destroy rocket button to get the mission log.
Recover Rocket
If you have a rocket on earth's surface with a heat shield on it, you can detach the heatshield, press the recover button, then "View flight log" to find your mission log.
If say you have a shuttle or something that you are recovering then find a way to get debris from it, else there is no way to get your mission log.