ME2 Hammerhead Continuity Issue

The "Overlord" DLC mission uses the Hammerhead vehicle. This mission is made available at the same time as the Firewalker introductory mission for the vehicle.

This can lead to confusion as the controls are not explained if the Overlord mission is attempted first.
Personally, I had no idea how the mining mechanic worked and nearly missed the requirements for the achievement in Overlord.

Overlord should probably not be made available until the first Firewalker mission is completed.