Steam are geniuses, achievements for BUYING games
I still don't really understand the allure of achievements, but they're actually turning a sale into a game, instead of just going 'looky here cheapie things, shiny, come buy', and for that I commend them.
I imagine I'll fairly easily hit 10 objectives, as I've already done two, and I'm off to buy Chime now

(cos it's a bargain mainly, more than because it's a point, however).
Ooh just looked, Chime I really wanted then forgot about, damn, there's no way I'm not slapping down a lousy pound for that. All music games need more 'Still alive'!
Really, unless you desperately want the ultimate TF2 hat, I imagine spending about £10 will get you entrance into the main draw.