Despite the description, this actually only needs you to visit all Alps Points of Interest for
Tour Guide, and all Alps Drop Zones for
...and you shall find. Unlocking all Drop Zones will also unlock all challenges without having to visit the challenges on the map, so they can be effectively ignored for the purposes of this achievement.
Credit to D4RK RON1N for the solutions to these achievements.
The Tour guide achievement in Steep worth 301 pointsFind 149 Points of Interest in Alps As a general tip, wait until you reach level 25 for the unlimited helicopter rides, which means free fast travel from the map to any location, and makes these achievements much faster to get.
Alaska is not required for any of these 3 achievements.