Achievements bugged?

[ZappieZap]

I've bought the game 2 weeks ago , and after I finished replaying the first one , I decided to play this one too , after a few hours in the game and after I've defeated Rametek and Bearer and Ergo in Erynes , I've noticed that I didn't get the achievements for that? But actually I didn't get any of the achievements at all , only one. At the point where I am right now in the game I should have at least five achievements probably but I got only one. Are they bugged or something? How do I solve this? ( ps: I'm always online whenever I play something on steam so I doubt it's because of that, I've also tried restarting it and it still doesn't work.)