0 0 0Actions The eel does two types of bites.1) Quick bites. No need to press anything here.2) Slow bites. The eel will open its mouth fully, then narrow it very slightly after a second or two. Boost once that happens, and you'll be safe.
0 0 0Actions As title says you must not be bitten in both eel chase sequence in the later part of underwater level. The easy method is mashing swim button all the time. If you notice that the protagonist "rolls" after the bite it means you failed. The achievement should pop out few seconds after you reunite with the turtle.