How many are there????

You can see for yourself by going to Achievements > Seasonal > Atebus Revolution Masquerade.

http://subeta.net/achievements.php#15 You can go to the 'Achievements' page and select the site event from the list at the left of the achievements. Alternately, in the case of new achievements (as is the case with the new achievement level of asking users to dance), selecting the 'Newest' option on that same Achievements page can show you the very newest achievements added to the site.

Ok, thanks.