The rarest achievement in chess.com!?

Some achievements are secret, so you can't see them, like Killer King, Man Vs Machine, First, Searching for Bobby Fischer, Castle victory, ect.

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There are 145 achievements

I have only 133

"only"

144

But until now, I still cannot get Surprise though I played crazyhouse on rated.

Castle victory 100%

@texonten you've solved 289 puzzles and played 502, how do you have Puzzle Addict?

i have all 144;  take pictures of my list & compare them with yours to 'see' which ones are missing.

There are 145 achievements

Prize winner

There are 145 achievements 

Not 144

i have prize winner & there are 144 total.

Yes you have

Sorry