Why the game with ~50% about coop lacks such stupid thing? why the second guy should waste his time coz of this and vice versa?
It is definitely no waste of time to play a fun game, both with and without achievements. It is even more fun to play it together with someone else, best a friend.
Why it wasn't feasible to add?
And why you don't indicate this information in the store?
I am not familiar with console games but does (nearly) every game exept DOS:EE unlock achievements for online co-op partners? If that is the case it should be stated on the store page. Anyway, the game itself is not influenced by that which is probably a reason why they do not indicate it.
lol... it's clear as a sunny day that your team just decided do not waste their time and resources for this.
I'm trying to understand your logic why you had the cheek to release a semi-finished product with a full price for consoles and withhold this information from us.
You gave the answer, they decided not to waste
resources on this minor issue and delay the experience for those players who do not care about achievements. As I stated above the game is fun by itself (and if not what it the point of playing it, anyway), give it a chance. Calling a game semi-finished because the achievements do not work the way you expected is quite an overstatement.