I have a new word: pseudoachievement (or, pseudo-achievement).
A pseudoachievement is something that feels like an achievement but is not. For instance, watching every episode extant of 24 is a pseudoachievement.
I'm not sure whether watching every episode of The Wire is a pseudoachievement or a real, if minor, achievement; maybe it's a quasiachievement.
I am sure that completing every level of the Linux computer game Supertux is a pseudoachievement.
Learning how to use italics in Blogger is a pseudoachievement.