Here is the full list of all 6 TimeTekker achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Earned the maximum possible multiplier on Merciless difficulty!
Achieved 10,000 points!
Achieved 2500 points and unlocked the Merciless difficulty level!
Annoyed the hero on the main menu screen!
Achieved 750 points and unlocked the Brutal difficulty level!
Launched the game