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