It's not how many seals you have, it's how many seals you EARN that day.

So say you do two caravans that day for a total of 100 seals. On most servers, that's enough to get on the list (especially for Twin Adders) because just about no one does Caravans or Company Leves.

Sure, there are a couple people that will turn in a quest and get ~700 seals (or do Darkhold for an absurd amount), but most likely there won't be a full fifteen people in your company doing that every day, it's really quite easy to do.

Now, the Hero of the Week on the other hand, is a bit harder. (And I still have yet to get it because I've done all the quests already and it's almost impossible to achieve on just caravans and leves.) :/