I have a couple of thoughts, I'm just way too tired to try to post them in a consistent order:
-so the whole theme is about collecting credits to catch the ride to andromeda; the goal is buying tickets for the ark
-credits can be earned through completing solos on silver-gold-plat difficulties (obviously, harder diff-more creds), and through significant achievements (like a 1.25 multiplier for 10 waves survived, or no gear/equipment used or such - could be stacked) I was thinking 20k for silver, 40k for gold, 65k for plat - gotta survive every mission, because a corpse belongs in the cemetery, not on the ark
-would be a 2-3 month long timed event with 1-2 new solo challenges coming out per week
-the leaderboards would be tiered from 0-5 - based on the amounts of credits collected
0 - stays in the Milky Way
1 - the sh*ttiest sh*thole on the ship - still, survives the Rippa attack, so yeah, it's something
2 - an okay cabin
3 - okay+ cabin with windows to look out at the... nothing between the galaxies. bummer
4 - the business ticket with some benefits
5 - the Burj Dubai of the Ark ship, grants an officer status
basically, you'd need to complete everything on Gold for tier 3; everything on Gold, with multipliers, plus a few plat runs for tier 4, and everything on gold with multipliers plus 70% of plat for tier 5
The tiers are of course useless, but good for bragging rights. It would kinda eliminate the speedrunning aspect of solos, and would concentrate more on completing them.
The challenges would be the same on every difficulty, the payout is what would differ.
We could have a google spreadsheet or something to keep the records, I would gladly help with that.