Full list of all 7 Cave Crawler achievements. It takes around 0-1 hour to unlock all of the achievements in the base game on Windows.
The base game contains 6 achievements, and there is 1 DLC pack containing 1 achievements.
Finish the boss battle in Level 5
Finish the Tutorial and unlock Level 1
Finish the Level 1 and unlock Level 2
Finish the Level 1 and unlock Level 3
Finish the Level 3 and unlock Level 4
Finish the Level 4 and unlock Level 5
Unlock and finish the Bonus Stage