Hangin' Tough Achievement in Primal Survivors

The two-boss version has less enemies and they're weaker, making it very easy to survive 10 minutes even with no upgrades. Focus entirely on DPS, picking skills that increase damage, attack speed, critical chance, piercing, etc., and you will plow through enemies so quickly that none will be a threat. There really isn't any other strategy here. I personally stayed away from most elemental stuff, especially burning, because enemies die too quickly for status effects to really matter.