Full list of all 9 Cruel Arena achievements. It takes around 1-2 hours to unlock all of the achievements in the base game on Windows.
The base game contains 7 achievements, and there is 1 DLC pack containing 2 achievements.
Survive 30 rounds
You are unstopable!
Kill 500 zombies
Do 50 headshots with the Crossbow
DO 100 Headshots
Kill 100 Zombies
play for the first time!
Survive 10 rounds
Die 5 times before the level 5