As Far As The Eye

Traits are unlocked on the end game screen after completing a successful Quick Game scenario, wherein the condition to unlock the trait is met.

This trait is known as Negotiator in game, not Bargainer.

The trait Negotiator is unlocked by making a trade with a friendly caravan. Friendly caravans appear, typically twice, in halts after the first halt. Select a pupil, select the friendly caravan, and choose the Meet option. After meeting, choose one of the conditions, and the trade will be completed.

Shy unlocks alongside this achievement upon completion of the run.

Traits are unlocked on the end game screen after completing a successful Quick Game scenario, wherein the condition to unlock the trait is met.

The trait Bargainer is unlocked by building and using the Market. The Market is a caravan appendix, which means it needs to be built connected to the Caravan. It allows for trading one type of resource for another, and costs 200 Wood and 1 Rhinoffalo. After building the Market, use it once to perform a trade, and then complete the run.