Dear Un-Muters,
Steam Achievements are finally implemented in "Mutated Muter's Invasion", so now playing the game is more rewarding than it was before! This update brings 31 achievements. Of course, the Community is still welcome to express achievement-related ideas, and will always be (even after Early Access)! This includes both ideas for other achievements that could potentially be added and feedback on the current ones.
You may have noticed that few achievements have expert-mode counterparts, while others that, as it may seem, could do the same, do not. For example, since the "Ain't Afraid of Any Saws" achievement does have an expert-mode counterpart, it might seem reasonable that the "That Crazy Jump" achievement do too. However, doing the "crazy jump" in the first quarter-note level is actually equally difficult in all of the difficulty modes, whereas passing the "annoying saws section" in the expert mode is an exceptional task. This is why the developer believes that choosing which gameplay-related achievements should have expert-mode counterparts should be done mindfully. At the same time, however, considering how difficult the game becomes in general in the expert mode, getting to promote your musical note rank in the expert mode ought to be rewarded; this is why these ("Quarter Note", "Half Note", and "Whole Note") DO have expert-mode counterparts. Now here is the nice part: if you unlock an expert-mode achievement, you automatically win its regular (non-expert) counterpart!
In addition, there are achievements for beating the game in the hard and the expert modes. The same principle applies: if you win the expert-mode achievement without having won the other corresponding achievement, the latter is also immediately yours! Please know that beating this game in the expert mode means you are really special!
Have fun!