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In this challenge, you have to kill 51 enemies with the Landstalker in 1:30:00; however, do not be afraid of missing any since there are more than you need to shoot. Stalker Turrets are your priority here, but you can easily destroy them with the mortars and your Battle Bots' EMP. Be sure to always fire your blasters, as they will help with taking out any enemy in your way. And be sure to always move forward, and take out all the Stalker Turrets, as they sometimes spawn Swarmers and DZ Strikers. If you keep moving and destroying, you should kill 51 enemies with around 10 seconds to spare and complete the challenge.