Here is the full list of all 10 Ruthless Safari achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Runs 5 kilometers
Runs 15 kilometers
Runs 25 kilometers
Runs 35 kilometers
Runs 45 kilometers
Runs 55 kilometers
Runs 65 kilometers
Runs 75 kilometers
Runs 85 kilometers
Runs 100 kilometers