Game mode descriptions regarding achievements
Make clear in the descriptions of the game modes that achievements can only be earned in roguelike mode. Currently the tutorial mode's description mentions that you can't earn achievements, but the others say nothing either way. I am aware that upon starting the game you get the message informing you of this fact, but currently the situation in game mode selection is inconsistent. I think giving information regarding achievements should either be delegated to the game start message completely, or somehow incorporated into the description in the menu as well. A sentence in the description of "Classic (roguelike)" saying "You can only unlock achievements in this mode." could be enough for example.