Sadly, this game is extremely simplistic as far as mechanics go. The difficulty achievements do not stack, so you will have to play through the game 3 times.
Start off the game by playing on easy. The playthrough should take you roughly 45 minutes to finish. There are no secret achievements or achievements for finishing tasks other than completing the game.
Once you have finished easy mode, move on to normal mode, and then to hard mode. There are 7 levels for each difficulty, and each level has an achievement. Once you have finish all 3 runs once for each difficulty, you will have completed the achievement list for this very simplistic game.
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