What are the two 'hidden' achievements, and how do I get them?

In BrowserQuest, the achievements list includes 2 that are denoted only as ??? / ???

I've already defeated the 'final boss' and completed all of the other achievements (Ignore the 16/20 there, the 2 I'm missing amount to 'get hit a lot of times').

What are these last two medals, and how do I get them?

One of them is in the cave behind three ogres and four pillars. always take the left most door (on the top or bottom, even if you just came through it.)

The other one is in town, on the far right. Go through the portal (the sparkly bridge thingy), wait for the item to spawn, interact with it.

The other one, I wont tell the name, is in the forest, in a cave behind three ogers and 4 stone pillars.

One of them is "For Science" You must get a Cake on the right side of village (Reference to Portal)

When you get in to the confusing cave, just go into either one of the first doors and keep going back into the door you came out of until you get to Rick.