Episode 2: The Cavalry
Scenario 3: Jungle Hike
When Nima stops your group to rest, don't go immediately for the radio. Have Jess look around, especially at the berry bushes. Switch to Gerry to have him talk to Nima about her wound. Nima will ask Jess to get her some blue berries to treat her injury. Have Jess look at the berry bushes on the right. Nima will confirm they're the right ones and once Jess gives the berries to Nima, the achievement will pop. :) See what taking the time to help someone can earn you? ;p