Can't get all achievements

So I have played medieval for awhile, got almost all achievements, except for 2 (finish 30 quests with 2 merchant and peteran priest).
I played one more merchant task and recieved the merchant achievement, but didn't save.
Then I finished the peteran achievement, and since then I couldn't get the last one * the merchant one.
I don't know if it has anything to do with the merchant or with this specific achievement. Is there a chance completing al achievements is bugged? Is it fixable?