The Ultimog Challenge is get 8000 points in ocean fishing

[Doozer]

Also bozja has a relic stage where you're asked to run CT 15 times iirc, step was awful.

You're not required to do CT for that step. You can get Loathsome Memories of the Dying from doing that x15, Castrum Lacus Litore x3, or an unknown amount of Critical Engagements in Bozjan Southern Front (random drop chance).