So happy to have it done, the final octoling encounter at the end took me hours and had me on the verge of tears. Just wanted to share this achievement because this level gets REALLY unfair and stupid. What a nightmare. I now have beaten every level with every weapon, surveyed every area completely, and achieved 100%. Maybe I should review this game someday.
I always loved the Champion's Road type levels in games, but this just stunk really bad. They literally just spammed the hardest enemy in the game on one small battlefield and they could just obliterate you in 2 miliseconds.