Do you mean every campaign and secondary quest? If so, some secondary quests are solo.
EDITED by Ling for the following Guidelines Violation: NON BID
Post a bid or do not post
Advice, questions and comments should be done via private message, ingame whispers, or email
Any post that does not contain a legitimate bid is considered to be a non-bid post
The posting of a bid to make your conversation within a thread “legitimate” will not be tolerated and may at the moderator's discretion result in a ban
There is no reason to post more than once in a thread unless you have been out-bid.
If you need to retract or decide to change your bid edit your existing post.
In short: post your bid, your IGN and contact information and nothing else or you risk a ban