not all missions appear at once, once you finish the missions that you have new ones appear. I've completed all missions so you can take my word for it.
In total you'll be able to craft 2 oddyesy orbs using your tokens (160 tokens total) and that's beside the other rewards you get from the missions.
Besides the tokens you get
- odyssey orb (besides the craftable ones, no tokens required)
- odyssey gem
- 1 ward
- 3 icons
- odyssey ziggs skin shard + border + icon
Edit:
piece of advice ;)
from the odyssey gem craft either the revel grab bag for a guaranteed 5 skin shards, one of each tier (excluding ultimate and mythic) or
if you want to test your luck a birdie bag for a chance to get a full set of skins. I got lucky and got the full bloodmoon line. It beside the project and snowday skinlines are the best to get. Less awesome would be the pentakill skinline for example, not may shared or expensive for that matter.