Full list of all 7 GymBro achievements. It takes around 0-1 hour to unlock all of the achievements in the base game on Windows.
The base game contains 2 achievements, and there is 1 DLC pack containing 5 achievements.
Catch about half of the kettlebells in the mini-game
Catch about a third of the kettlebells in the mini-game
Get 75 points in platformer
Get 50 points in platformer
Get 25 points in platformer