theHunter: Call of the Wild

This is definitely the easiest of the Yukon Valley mission arcs as most of them simply require you to go to different places on the map and interact with things there. The missions are given in the following order.

A Book By It's Cover
Travel to Frontier Vista Outpost
Photograph the landscape from the Frontier Vista outpost with the bridge included

A Study in Crimson
Spot a Caribou and Plains Bison in the Crimson Plain

From The Ashes
Photograph the plant growth in the burnt forest
Take a soil sample in the burnt forest

Track Record
Examine Moose, Caribou, Plains Bison, Grizzly Bear, Gray Wolf and Red Fox footprints

Old Story, New Problems
Travel to the old dredge
Take water samples near the old dredge

Mucking In
Examine Harlequin Duck and Grizzly Bear droppings in Stonehollow Basin

Keep It Clean
Travel to area marked on your Huntermate, Install a water monitoring station

Upon finishing Keep It Clean you should pop the achievement.