Body Strengthening Realm: 4 small stages. (Muscles , tendons , bones , meridians).

Qi condensation Realm: 4 small stages. (Early, Middle, Late and Peak).

Foundation Establishment Realm: 4 small stages. (Early, Middle, Late and Peak).

Hard for more than 80% of martial arts to condense , only 20% of MA do it.

Half-step to Core formation

Core formation (Martial artist at this realm are known as 'Masters') : 4 small stages. (Early, Middle, Late and Peak).

Half-step to Nascent Soul

Nascent Soul (Martial artist at this realm are known as 'Grand Masters'): 6 stages

Very hard for a martial artist to breakthrough, only geniuses are able to pass to this stage.

They can fly , and are consider immortals in Huibin (continent.).

Pre-Celestial (Martial artist at this realm are known as 'Sages'): 6 stages

After that, well that would be spoilers :)