Beating all necessary bosses on Insane for the "Don't Even Try This" trophy/achievement. Timestamps below.
Since you have basically no HP on this mode, defeating them without getting hit is generally required. After finding a few health upgrades, you MIGHT be able to take a hit from certain attacks (I survived Lupiar rolling into me in this video), but it's usually not worth going for them.
The beginning is tough, but things become easier as you gain powerful reward items from the no damage boss fights. Spam arrows with Edea's Pearl and Pocket Incensory whenever possible, to stay out of harm's way, and make good use of your active items to shorten the battles. In particular, the Bakman Patch, Sparse Thread, and Crystal Seed (replaced by the superior Tainted Missive later) are great—some bosses can be destroyed incredibly fast this way, which I tried to show.
Because Fennel can be pretty difficult without the Incensory to stun her, I recommend vanquishing Arsonist first. Thankfully, the good ending isn't required for this trophy, which makes the final boss a bit easier.
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