My achievement yesterday was getting the knack of Scriabin Op. 11 no. 17, in those moments where there is contrary motion between the hands, the left hand playing descending chords and the right hand ascending melodic notes. I've tended to avoid thicker textured music with a bunch of chords at quickish tempos, and, playing through the piece I was getting mentally bogged down trying to process what's going on and where to put my fingers and how to articulate (the left hand is marked staccato and the right hand not). It's a really good feeling when my brain isn't telling me "lets slow down so I can figure this out" so I can better focus on the music. I'm making an effort this year to do more pieces with thicker textures to get out of my comfort zone.
Another thing is that I've been working on my trills for the last month. In Bach's 6th Sinfonia, one of the weakest parts of my playing is a simple right hand trill while the left hand sounds the theme modulated onto the dominant. Yesterday was the smoothest and most controlled I've managed to yet. I also do daily practice of that part in Sinfonia 2 where the right hand does a 3-5 trill while playing notes with 1-2. It's the one thing that's stopping me from concertedly learning the piece. Yesterday was the quickest and smoothest trill I've managed to do there. It's one thing to do something isolated in practice, and another to be able to do it in the flow of a piece, though, but it's still heartening.