Pomodoro application which shows time in menubar
Pomodoro looks like it might do what you need. 


Can be minified to menubar and shows remaining time there (✔)
Has a tasklist (possible ✔) Its called a log in the app and the webpage says for each timer you can "add a meaningful description, press Ok and pomodoro starts")




The latest release is available on the MAS for $5. However, the developers site also says you can either download an older version for free, or build the latest source yourself:


  Buy the latest approved release from the Mac App Store℠, go to the
  Downloads section to get old 0.31 binaries, or access the source at
  the git repository to compile on your own the latest and greatest
  version. 
  
  Pomodoro is open source: you can donate a small amount of money if you
  really liked it and don't want to buy it from Mac App Store℠.