The "wiggle" strat (mentioned a few comments below) has to be included in the guide. I didn't understand the timing at all and didn't even know if I dodged successfully (I didn't) before I read about the "wiggle". Then I could actually do it and did it on the 2nd try. Like the guide should tell you WHEN to dodge, not just that you have to do it "on time" and "not too early or not too late". That means nothing if you don't know WHEN the right time is. Also a gif of a successful dodge would help so you could compare the two.

So glad to have gotten this achievement by accident on my first blind run. It doesn't seem all that hard, but I would not have had a fun time replaying the whole turtle section each try.

@DaverTheDave Same lol, was quite flabbergasted that this is a rare achievement.

I accidentally got this achievement on my first run without knowing anything about it. Just spam dashed my way through

god this was so helpful, thank you. It took me about 4 restarts before i looked up this guide, knowing the bite pattern and remembering that the game moves through the sequence for you helped me focus. great guide

The mouth wiggle was the most helpful tip, as someone in the comments mentioned

Juste perfect, thx mate !

In other words, you dash while it closes? Don't do it preemptively?

When the eel is about to bite, it "wiggles" its mouth for a moment, you notice this movement in the gifs you added. That moment (when the eel mouth "wiggles") is the moment you should press jump

Very good guide for this achivement. A very good tip I would give is, if you are having problems with dodging the telegraphed attacks do this, every time the eal opens its mouth dodge and then spam dodge you will evade the attack at the exact time dodge works again, it worked very well for me the moment I found out this trick I got the achivement first try.