The First Descendant

Intercept Battles are launched from Albion by speaking to Seneca right near the front. The first one you go on will be part of the main story to defeat the Grave Walker, and more will unlock as you complete story missions. You can simply repeat the Grave Walker fight nine more times to unlock this achievement though.

Note: As mentioned in the Road Map, many of the cumulative achievements in this game are finnicky, so I would suggest doing this all in succession, or at the very least in a single play session to ensure it unlocks properly. The tracking may reset if you log out of the game.