Heres a scenario: The enemy team has just defended the full ten minutes from you on attack, and you want to end the battle as quickly as possible to get into your next game. but still your team insists on bunkering. What do you do?
You can actually help the enemy. If a player killed had a seaforium charge when they died, it is dropped to the ground, pickuppable by anyone. If you pick these up on the defensive, You can still place them, and they will be un-disarmable by your team, and still damage your walls (And, they count towards the achievement)
So, if you want to end the game quicker, just hover around the fight zones and pick up any Seaforium charges you see, place them at your own walls. Easy peasy achievement credit + faster lose