Rollerdrome

The Spider Tank MK. I is the "boss" at the end of the Eiger Resort level in the "Quarters" section of levels (second set of levels and it's the last one, the one with the mountain icon) You have to go through the first section by killing all the House Players, and then you follow an arrow which will lead through to a massive drop, when you land you see it, there will be glowing vents on top of it the you have to damage in order to take it down

You can easily do this by activating "Invincibility" in the assists options and any other assists options you want (I want for Invincibility, infinite ammo and infinite Reflex Time just for this achievement) if you enable any assists, your scores won't be submitted to the Leaderboards but you will still get achievements