Secret Achievements How to get them?

Full House: Win without losing any pieces (not to be confused with Peaceful Victory, which is fake)

Killer King: Checkmate your opponent with a king move

Nick of Time: Checkmate your opponent with less than a second left on your clock

Full Day: Spend a cumulative total of twenty-four hours doing puzzles

Searching for Bobby Fischer: Go to the game database and...search for Bobby Fischer.

The Christmas (December) Bots all have their own badges for defeating them.

Juggler: Have 20 or more active daily games at once

Marathon: Play a game that lasts over 100 moves

Good Read: Make a blog that gets 100+ views

Good Habit: Do puzzles for 7 days in a row

First: Comment on a daily puzzle

Man vs. Machine (UNOBTAINABLE): Play against a bot in live chess