I'm not poo pooing games in general other than to say maintain an awareness of when they are played for enjoyment and when they are played as a coping mechanism to run out the clock.

But specifically achievements are slimy because they are technology to lock a certain vulnerable subset of people into playing more than they really want to. Or to create a false sense of investment into a particular platform so consideration of switching would include a sunk cost aversion.

Achievements like those in the pre-networked world for rewarding in-game unlocks for alternate gameplay are more or less fine.