Player one
Take one landmark cluster or biome and report each unlock by its exact Index name.
Divide landmarks or biomes between players, then compare the Index before repeating a route.
Take one landmark cluster or biome and report each unlock by its exact Index name.
Take a separate cluster. Avoid following the first player through the same landmarks until both passes are reconciled.
Open the Index, list what remains unchecked, and assign only those exact names for the next search pass.