[X] Keep distance and kite
[X] Check for weak points in its armor, or ways to reliably grind it down. Keep moving and don't let it surprise you through burrowing. Be ready to use atomic blast AoE if it does catch you, or as a surprise attack. Then follow up with aggressive melee blitz at whatever injured areas/weak points you can find.
--[X] Shoot it in its eyes first. Even if it isn't reliant on them to fight, it's the easiest sense to deprive it of, and it'll make it easier to fight regardless.
Gonna make this an actual vote, now. It's surreal to see any vote I make even getting consideration, tbh.