Image: Rebel Wolves / Bandai NamcoOfficial screenshot from Rebel Wolves / Bandai Namco.
Untouchable is earned by landing five Perfect Blocks in a row. Most players get it naturally, but it can take practice on the harder presets.
In any fight, time your block to land a Perfect Block five times in a row without a mistake in between.
Pick a slow, predictable enemy and focus on blocking instead of attacking. If it is not clicking, guides suggest dropping to Story difficulty for a wider window. Just keep in mind that changing difficulty voids Uphill Battle on that save.