What are these secrets in TBOI Afterbirth+

The gamepedia wiki's Achievements page includes the related secret numbers.

In particular, for the three in question:

• 325: "Participate in 31 daily challenges (they don't have to be consecutive; it will still count if you die in the first room)"
• 339: "Collect every item in the game, unlock all secrets and endings, and complete the bestiary"
• 385: "Sleep in 10 beds"