The original secret achievements, the so-called cryptic, glitched achievements have already been identified elsewhere on this site.
Some, such as the "Rare, Medium, Medium Well, and Well Done" achievements seem similar to the "Medium Rare" achievement (added for the steam summer camp event).
Others, such as the "Well look at you!", "Seneca Falls", and the "Suffragette" achievement also have no unlock text, and they do not appear to be similar to existing achievements, either.
What do I have to do to earn these achievements?