I think achievements are an abomination. I think they ruin the way you play the game. They break immersion and make you hunt for virtual trophies, instead of focussing on the game. So I am happy in that way, I am not getting it. If there are some changes to the environment however, I would at least like to see a screenshot/video of it.
Though I must say, I think it is a bit weird, that they support steam more than their own platform gog. But I guess steam is more popular sadly still, so they want to promote the game first. I only buy physical copies, although it has been getting harder and harder to do so, but gog would be the only platform I would happily use, if I was able to get all my games there at one place, even the old ones, I bought on CD/DVD.
I don't hate steam, I just hate the DRM and the achievements... (Although I must confess that I own The Settlers 7 and Assassins Creed 2, which use/used UPlay. I bought them them for 10€ though. But AC2 disappointed me. The climbing was fun in the beginning, but the game soon bored me and the weird
-stuff destroyed the story for me. Still hoping Settlers 7 removes the DRM as well, although it is still worse than 2-4.)