3 degrees, not 33.
There are three (3) degrees in Freemasonry, not 33. A full Master Mason is one who has been "raised" to the "sublime" Third Degree. That's all that's required to become a Master Mason and participate in a local lodge.
There are concordant Masonic bodies, such as the Scottish Rite, who award additional degrees. Scottish Rite has degrees 4-33. Degrees 4 through 32 are earned, whereas the 33rd degree is attained by acclamation (you are voted in, there are limits on the number of 33rd degree Scottish Rite masons wandering around smartly.) York Rite has a similar, albeit, smaller degree structure.