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Achievements for [Medium Badge] are counted to date (automatically). If you don't see them right away, restart your game/reload your page. Sorry for my english ;)
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Hint to a lot of hidden achievements: open new tab paste in the same url, fall down a lot. Click center of hamster wheel
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144) Ode to Joy – Play Ode to Joy on the Piano
(Play Ode to Joy on the Piano – Floor Two: E, E, F, G, G, F, E, (D))
145) Twinkle Twinkle – Play Twinkle Twinkle (Little Star) on the Piano
(Play Twinkle Twinkle Little Star on the Piano – Floor 2: Low C, low C, G, G, A, A, G)
146) Row Row Row Your Boat – Play Row your Boat on the Piano
(Play Row Row Row Your Boat on the Piano – Floor 2: Low C, low C, low C, D, E)
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I can't figure out achievements 144-146 (I don't know the notes to any of those songs and am not a musically inclined person) or 207-213 (they seem to have a coffee-related naming pattern but I can't figure out what that could refer to).