It's not so much that they are important to the functionality of a game, but it's a modern fad to have them now, so in another way yes they are important.
There's one group of people that don't care, but two groups of people that a) gain some minor enjoyment from them for whatever reason and b) gain a huge amount of enjoyment from them for whatever reason. From the marketing side it's almost silly not to have them now. I am confident in the latter because I sell armfuls of games to people that go out of their way to buy games with "big" achievements in them.
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