angelsk said:Disagree
is 100% missable because I missed it. If you don’t let all the spiders spawn you have to replay
At least two online sources say the only missable achievements are "Deadly Spin" and "Blademaster" because enemies don't respawn. I think it's impossible not to spawn all the enemies as you play through, because you have to walk by all the areas where enemies spawn in order to make progress. I guess you could deliberately choose to run past certain enemies, because not all fights are mandatory to continue, but I think the enemies will still be there if you return later, even after defeating the Nightmare of that area or completing the game.