There are a total of 62 achievements for players to unlock:
In the list below, you can check out all the achievements. Specifically, the secret ones are on a different page, available at the bottom of the page, to prevent you from receiving unwanted spoilers:
Complete your first workout One-Time Unlock
Complete a workout on the same day it was released. One-Time Unlock
Complete your first Punch Workout. One-Time Unlock
Complete your first Blades Workout. One-Time Unlock
Complete your first Hit Back Workout. One-Time Unlock
Complete any workout in the Light intensity. One-Time Unlock
Complete any workout in the Moderate intensity. One-Time Unlock
Complete any workout in the Intense intensity. One-Time Unlock
Complete any workout with 2.5 minutes duration. One-Time Unlock
Complete any workout with 5 minutes duration. One-Time Unlock
Complete any workout with 10 minutes duration. One-Time Unlock
Complete any workout with 15 minutes duration. One-Time Unlock
Complete any workout with 20 minutes duration. One-Time Unlock