I've experienced a bug with the achievement called "A Unique Collection". Yesterday I killed Merrium and Otzi, and today I killed Haures. Every time I kill a unique, I immediately check the achievement screen to make sure that I got the check mark. In all three cases, I did.
Then today, I look at them, and the check marks for both Merrium and Otzi are gone! I scrolled down and, and those were the only ones missing. Then about five minutes later, I looked again and the check for Haures was gone too!
This is a real bummer because those uniques are super hard to find, and can take many hours each. Can you please fix this bug and give me the check marks back for those three?