exobyte

Recently i was achievemnet hunting for legendary defender and got the brute force, mastermind, and defence is the best offence achievements and after beating it i noticed i didnt get legendary defender. After checking the crystal i noticed that apparently i didnt have brute force, mastermind, and defence is the best offence. After putting so much time and effort into these, im very frustrated to have lost them. Even in steam it says i still have the achievement. Is there anyway I can fix this?